In JavaScript, regular expressions are also objects. Now you want to replace all the dialogue quotes with double quotes, while keeping the single quotes used in contractions like aren't. This is accomplished by putting the end marker in backquotes:. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Covering the basics. It is important to remember that double-quoted string replaces variables inside it by their values, while single-quoted string treats them as text. Double-click a word to select it. When clicked, it added a class to a hidden paragraph, and animated that paragraph to become visible. 7, (3) Firefox 0. Add one ‘R’ or ‘r’ to the start of the string and that’s it. Strings that are NOT enclosed by double-quotes are "raw", and need no additional processing. The same quote (but with AWK rather than regular expressions as the punch line) shows up in the sig of John Myers post from 1988, where he credits a “D. Use double quotes since you can't escape the single within single Start a positive lookbehind group. HTML tag, start with an opening tag "" , follow by double quotes "string", or single quotes 'string' but does not allow one double quotes (") "string, one single quote (') 'string or a closing tag > without single or double quotes enclosed. * Don't override edit conflict suppression on section edits; section merging should provide the expected transparency here and fits usage patterns better. This looks contrast buddy Do we need the one between double quotes or Other than the one between double quotes. to remove the need to double up any single quotes. com/profile/09807241109913660214 noreply. Regex for matching quotes and single quotes. you must double any \ that you use in LIKE strings. When clicked, it added a class to a hidden paragraph, and animated that paragraph to become visible. MathWorks Support Team (view profile). Special care must be taken with the expression pattern. This context will extend its parent, causing the ending regular expression of the "string" context to not match the escaped double quote. 9 posts a VB script which uses the Regex library to remove all double quotes' ' ' Set up the regular expression "search fo a double quote" '. NextMatch method to perform another search starting where the last one ended. This is a generic, titled admonition. 3 R the listeners currently keep a copy of every sample they display, apart from: er • Summary Report , especially if most samples only take a second or two at most. The regular expression ". Hi, My website scrapes the content of another website for certain information and display the same on my webpages along with links. Imagine you have written a story and used single quotation marks throughout to mark pieces of dialogue. WBMPImageWriter3=Output has not been set. use double quotes if you want shell variables to be recognised, rather than single quotes. Search text. Also, the regex should allow for escaping a quote symbol with a backslash if it's the same symbol (double or single quote symbol) bounding the string. Regular expressions are used by several different Unix commands, including ed, sed, awk, grep, and to a more limited extent, vi. The value will always be the contents from the second capture group. I had been programming with Perl for many years before I actually took the time to understand what the rules are for escaping characters. I want to be able to split this string by those grouped by the double quotes first, and then the non-quoted words second. Regular expression is an art of the programing, it's hard to debug , learn and understand, but the powerful features are still attract many developers to code regular expression. For pagenames that match, their subpage titles match by definition. This is known as the variable interpolation in Perl. This is often used with here-docs. Special Characters. Backslash in a regex must be either double escaped like \\\\, or else single escaped within a character class set like [\\] Escaping Quote and Backslash within /G:FILE literal search strings. select replace (@aa, '''', '"'). I haven't had any luck using the RegExp object, because I can't create a new instance of the object. To specify a literal single quote, escape it with a backslash (\). $Id$ ----- X-CART v4. * 'cause today's effort makes it worth tomorrow's "holiday" * * Becomes: * * ’cause today’s effort makes it worth tomorrow’s “holiday”… * * Code within certain html blocks are skipped. The [], known as character class (or bracket list), encloses a list of characters. You need to use double quotes in JSON. Regex match single and double quotes problem. You'll need to use double. Would appreciate some help. ) The plus sign (+) is used to indicate that consecutive delimiters should be treated as one. The simplest way to specify a string is to enclose it in single quotes (the character '). For more information, see Regular Expression Options. I've heard there's two ways to do this: 1) By using the RegExp Object, and 2) simply using the Replace() function. The state-list part of a rule will not be discussed here. attr-name-ignore-regex. PL/SQL Enhancements in Oracle Database 10g. 13 through 8. What regex will be needed to remove the double quotes and leave single quotes in place? splunk-enterprise regex double-quote single-quote featured · answered Mar 1, '18 by somesoni2 ♦ 134k. Enclosing characters in single quotes (''') preserves the literal value of each character within the quotes. If you need to use both double and single quotes you can use a grave accent to encapsulate the JavaScript string - this is also useful because lots of cross site. Characters, HEX, ASCII at TechDictionary. Write a regular expression that you could use with egrep that will find all entries in /usr/share/dict/words that contain the sequence 'aa', 'ii' or 'uu' consecutively. When first attempting this problem, most people consider the regular expression: /\*. How to use regular expressions (RegEx) in SQL Server to generate randomized test data A regular expression (abbreviated regex or regexp and sometimes called a rational expression ) is a sequence of characters that forms a search pattern, mainly for use in pattern-matching and "search-and-replace" functions. Replace double quotes with a single quote within a double quoted string Hi Froum. In a regular expression it specifies that the previous character set can appear any number of times, including zero. A list of comma delimited "pattern":"replacement" pairs. a repeated pattern, most commonly used to make sure single or double quotes balance. Encodes or decodes a string so that it conforms to the the Uniform Resource Locators Specification - URL (RFC 1738). 9 Answers are available for this question. print "@ARGV "; It might be tempting to think that the argument here is a string, but it is more accurate to say that it is an expression that, when evaluated, yields a string. † When using egr ep, I usually wrap the regular expression with single quotes. select regexp_extract(my_source_column,’^[0-9]{1,18}$’) from … This will only return an integer of up to 18 digits. These double quotes are the same type of double quotes that define the beginning and end of a string. " Vimball Archiver by Charles E. The best way to do so is by using a capturing group, because we know the match starts and ends with ", and we can easily target it, but we also want to remove those quotes from our result. As long as the key value pairs are consistent, it will grab them all. I have tried switching all of my escaped " to ' and then I can display the part in double quotes but not the part with a single quote. Global replacement. That is correct. 1-2001: * ? [ # ˜ = % The various quoting mechanisms are the escape character, single-quotes, and double-quotes. This can be greatly improved by combining these into a single SQL insert. To escape a single. There is an easy way to match values within single quotes or double quotes using Regex. Examples are the \bibfield{keywords} and \bibfield{options} fields. The enclosing quotes are not included in the group of characters. A string of text will be treated just like a single line of input from a file, the string must be enclosed in double quotes (or single quotes with usebackq). I have been able to use regular expressions in Quick Macros as long as there are no double quotes in the strings involved in either the subject string or the RegEx string. In computer programming, leaning toothpick syndrome (LTS) is the situation in which a quoted expression becomes unreadable because it contains a large number of escape characters, usually backslashes ("\"), to avoid delimiter collision. Write a program Paste. Then the back-reference should be the exact character (single character) that was matched and captured. 1 === * The installer now includes a check for a data corruption issue with certain versions of libxml2 2. Tagging of Regular Expressions In many situations, it's necessary to retrieve just a portion of text which matches some regular expression. I'm continually amazed at the number of people, even on Hacker News today, who don't realize that every single question and answer is editable on Stack Overflow, even as a completely anonymous user who isn't logged in. Programming, Web Development, and DevOps news, tutorials and tools for beginners to experts. FolderMill User Guide will help you start using FolderMill fast! Learn about all the program’s settings and features to convert, print, rename, copy, filter files and assign different tasks to Hot Folders easily. Escaping characters in Ruby, and many other programming languages, can be quite confusing. BTW, the Regex. The simplest way to specify a string is to enclose it in single quotes (the character '). Strings are scalar as we mentioned previously. The operator =~ associates the string with the regexp match and produces a true value if the regexp matched, or false if the regexp did not match. Red Hat Enterprise Linux 5 CentOS Linux 5 Oracle Linux 5 Buffer overflow in the ReadImage function in generic/tkImgGIF. Using double quotes cause variables embedded in the string to be replaced by their content while in single quotes variables name remained the same. "I didn't do it") and likewise single quoted string can contain double quotes. (re-pattern """) creates a regex from the string ", which matches a single double quote. 3 R the listeners currently keep a copy of every sample they display, apart from: er • Summary Report , especially if most samples only take a second or two at most. * * A group of regex replaces used to identify text formatted with newlines and * replace double line-breaks with HTML paragraph tags. You can split a string on a single character, a group of characters or a regular expression (a pattern). WBMPImageWriter0=Output is not an ImageOutputStream. Tagging of Regular Expressions In many situations, it's necessary to retrieve just a portion of text which matches some regular expression. VERBOSE flag. egrep regular expression Hi, I have output like so: 1 usera 23 userb 937 userc I would like to have as good of a match as possible, I've been trying egrep with the following: egrep -c "^[0-9]+[[:space:]]+${user}" Where ${user} is the user I'm searching for. The exact same, but with double quotes in place of single quotes. The \"raw-file\" and \"raw-files\" variants fetch the specified files and then store the raw file data in tiddlers, without applying the import logic. I have a need to replace single backslashes with double backslashes. The I modifier to regular-expression matching is a GNU extension which causes the regexp to be matched in a case-insensitive manner. Best is to use single quotes instead of backslashes to escape * to the shell (because single quotes are strong shell quotes that escape every character but the single quote character itself), and use backslashes to escape * to grep. lets say i have a text-box and the string in it is something like 'hello this is "world" something else' how do i get only the text between the quotation marks wait what. begin is the pattern that starts the block and end is the pattern which ends the block. /* Tags file maker to go with GNU Emacs -*- coding: latin-1 -*- Copyright (C) 1984 The Regents of the University of California Redistribution and use in source and. Echo just the date from the following string. If the regular expression contains groups (surrounded by parentheses) then the value of each group in matching filenames is added as an extra column to each line read from that file. C and Java use double quotes for strings and single quotes for characters. The regex should return 2 matches - 1 for each sentence. To see what the tokens are, just use a for loop:. Each is a regular expression pattern. The single quote (') character does not need to be escaped in Active Directory, but the double quote (") character does. Here we use MatchEvaluator to uppercase matches. 7 and PHP earlier than 5. org with this single line in the body of the message: unsubscribe web4lib Shortly after you send this command, you should receive a confirmation message from the listserv reading, "You have been removed from list [email protected] * :file:  Regular expression for recognizing and highlighting keywords. A double-quote character can be included in the group by quoting it with a backslash, (e. See, if for any reason the subject string has an odd number of double quotes as is the case here, you cannot be sure that two quotes matched by "[^"]+" belong together. java,regex. htm db/journals/acta/acta38. The value will always be the contents from the second capture group. *, could easily be more double quotes. In favor of both. private string ReplaceQuotes( string sentence) { Regex re. Python's flexible string literals allow us to simplify the pattern, though. Here are just some examples that should be enough as refreshers − Following is the table listing down all the regular expression Meta character syntax available in Java. An example is. Replacing Double Quotes with REReplace() 16th May 2007 / 0 Comments / in Coldfusion / by Tom King Faced two problems whilst looping over some database entries today (with data coming from many RSS feeds, so essentially data which could contain anything). :Directive Content: Interpreted as body elements. The only conceivable difference I can imagine applying to single versus double-quotes is if the code internals use some kind of regular expression on parsing out the ASCII/Unicode characters which function as boundary delimeters. ' when performing Regular Expression search/replaces on parts of a string). Regex delimited by normal string delimiters (double quotes) Escape symbol for string and regular expression is the same, which leads to double escaped backslashes \\\\ Using a literal string can be used to prevent double escaping backslashes, but in turn it requires double quotation marks to be escaped using double, double quotation marks "". In PowerShell's regular expression constructions it does not matter if you use single or double quotes. i have one textbox. As backreference variables are usually not preset, PowerShell will replace the variables in such a case with the empty string. For example, in Perl:. For using this important text, you need to extract them between single or double quotes from cells firstly. Though this regular expression may seem more complicated than it needs to be, it is much faster than simpler solutions which can cause a whole lot of backtracking in case a double quote appears somewhere all by itself. Usage While re2 uses the same naming scheme as Ruby's built-in regular expression library (with Regexp and MatchData ), its API is slightly different:. With double quotes, variables are expanded. to remove the need to double up any single quotes. Instead, regex support is provided by the standard regular expression library. If GREEDY is non-nil, extend the match backwards as far as possible, stopping when a single additional previous character cannot be part of a match for REGEXP. To specify a literal single quote, escape it with a backslash (\). The \"raw-file\" and \"raw-files\" variants fetch the specified files and then store the raw file data in tiddlers, without applying the import logic. com - The first Regular Expression Library on the Web!. Finds one text value within another (case. " Vimball Archiver by Charles E. To see what the tokens are, just use a for loop:. \item[Separated value fields] A separated list of literal values. In this example, [0-9] and +. Unquoted style requires no quotes, but does not support any escaping plus care needs to be taken to not use any symbol that has a special meaning in. 10b0 pip install black Copy PIP instructions. Use table selector from toolbar to exact data from different hierarchy (i. I need help replacing my double quotes of my log file with single quotes. How to achieve it?. 2 Basic Unicode Support: Level 1. I did a cut&paste of the one liner in your gist inside my tests and most of the tests fail. Full setup instructions provided. So I could do something like this to have a different type of message:. Within a string delimited by single quotes, a single quote is represented by two single quotes, and similarly for double quotes. The fn:replace function replaces parts of a string that match a regular expression. The regex [0-9] matches single-digit numbers 0 to 9. 1 regular expression engine interprets backslash escapes itself. Simply put, a regular expression is a text pattern. Remember: parentheses, around quotes, around the slashes for the Perl function, around the actual regular expression. Regex Tester isn't optimized for mobile devices yet. Regex lets you find text by pattern, such as any characters that are repeated exactly twice. match() function. The author-supplied title is also used as a "classes" attribute value after being converted into a valid identifier form (down-cased; non-alphanumeric characters converted to single hyphens; "admonition-" prefixed). grep only requires 1 backslash to escape another backslash, but the shell also requires backslashes to be quoted. All C strings begin and end with double quote characters. [^ " \\ \r ] *) * " matches a single-line string in which the quote character can appear if it is escaped by a backslash. Regex in grep to match all lines ending with a double quote (") OR a single quote (') Hi, I've been trying to write a regex to use in egrep (in a shell script) that'll fetch the names of all the files that match a particular pattern. Introduction. Two of them use marks used for quotations in English usage, and are sometimes called the single quote and double quote. Batch file to remove double quotes from a file. As backreference variables are usually not preset, PowerShell will replace the variables in such a case with the empty string. The regular expression cannot convert elements in which the content is split. match the first char in string if followed by any letter except the 2nd match the first two if followed by any but the third, et cetera Then the only thing more is to allow a partial match of the string at end of line. Imagine you have written a story and used single quotation marks throughout to mark pieces of dialogue. The last character cannot be a colon. Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns. quote_literal(42. It doesn't seem to scale to well to large sites who want to describe every single page or resource on their server, but that's not the goal here. Must be reset with reset(). A string of text will be treated just like a single line of input from a file, the string must be enclosed in double quotes (or single quotes with usebackq). For a brief introduction, see. Then index into str using TF to display the file names that end with '. Not the most elegant of solutions, but it gets the job done. 我想写一个正则表达式来匹配用单引号括起来的字符串,但不应该匹配一个双引号括起来的单引号的字符串。 Example 1: a = 'This is a single-quoted string';. - Period matches any single character. C# Code Snippet - AddSlashes StripSlashes Escape String. But for replacing a single quote ('), you need to modify the SQL Statement with a little modification. In these situations, you should usually use single quotes, because double quotes require backslash escape sequences and things get very ugly very quickly. Versions of sed written for DOS invariably require double quotes ("") instead of single quotes to enclose editing commands. There is a problem where updating meta in bulk would likely be impossible or very painful. Default: false. yml new file mode 100644 index 0000000. When single quotation marks enclose a string literal, the value of the literal is the value within the quotation marks. Line Indexer: Macros to bookmark lines and list them in a Command Results window so that a double-click finds the appropriate line in your document. Query result set - 8 rows returned: Practice #7: One or more single quote characters inside a literal string quoted with two double quotes needs no special treatment and need not to be doubled or escaped. Strings in Visual Basic. Parsing quoted strings. This Excel tutorial explains how to put double quotes in a text formula in Excel. Hi everyone, i need help with a regular expression. From: Subject: =?utf-8?B?QWthZGVtaSDDp8O2bGxlxZ90aSAtIEN1bWh1cml5ZXQgRcSfaXRpbSBIYWJlcmxlcmk=?= Date: Tue, 02 May 2017 14:31:38 +0900 MIME-Version: 1. MatchCollection: This is populated from the pattern specified. The notation sed 's/"//g' is instructing sed to do a search and replace on all occurrences of double quotes, substituting them with nothing, s/"//g. Double quotes allow for embedding of un-escaped single quotes. Write a regular expression that you could use with egrep that will match lines in names. Or, download the RegexMagic manual in PDF format for offline reading or printing. Regex to remove . Add one ‘R’ or ‘r’ to the start of the string and that’s it. For example, "\01""1" represents a single string: the octal value 1 followed by the. The backslash (\) in a regular expression indicates one of the following: The character that follows it is a special character, as shown in the table in the following section. You need to use double quotes in JSON. With single quotes, the string is taken literally and no expansion takes place. printable characters). This is a generic, titled admonition. String literals can use single or double quote delimiters. Matches Quote. and the following may need to be quoted under certain circumstances. Notice how the inner characters, caught by. the same function name is used with different numbers and types of arguments. For using this important text, you need to extract them between single or double quotes from cells firstly. When clicked, it added a class to a hidden paragraph, and animated that paragraph to become visible. Answer: difficult. Let me show you an example :. Regular expression (pattern): The pattern which is searched for in the target sequence. perform the substitution only for html tag attributes, but not outside. This example selects root level hierarchy (i. Index: mutt/ChangeLog diff -u mutt/ChangeLog:3. It's a boon to text processing, though, enabling you to do a great deal with just a few lines of C++ code. A double quotation mark preceded by a backslash (\") is interpreted as a literal double quotation mark character ("). XXFor example, the regular expression /$$/ will search for a dollar sign at XXthe end of a line. FOR /F "tokens=4 delims=," %%G IN ("deposit,4500,123. Use double quotes since you can't escape the single within single Start a positive lookbehind group. To specify a literal single quote, you will need to escape it with a backslash (\), like in many other languages. Only printable characters can be used when using this form. 5' quote_nullable(string text) text: Return the given string suitably quoted to be used as a string literal in an SQL statement string; or, if the argument is. However, in Java you can also use \1 in the match string to insist on a match for some expression found earlier in the string, i. how to use regular expression validator to accept single quotes. This is always put at the beginning of the big regular expression (although double-quoted strings can be fit before actually); the string double-quoted (or double_quoted), that allows you to match a string. 1-2001: * ? [ # ˜ = % The various quoting mechanisms are the escape character, single-quotes, and double-quotes. Here are just some examples that should be enough as refreshers − Following is the table listing down all the regular expression Meta character syntax available in Java. The whole numbers may optionally have a leading negative sign. Match by word groups grouped in double quotes 2. [^aeiou] Matches any single character not in the specified set of characters. XXFor example, the regular expression /$$/ will search for a dollar sign at XXthe end of a line. Hope this helps. c for Washington's IMAP Server (UW-IMAP) before imap-2004g allows remote attackers to execute arbitrary code via a mailbox name containing a single double-quote (") character without a closing quote, which causes bytes after. The title may be anything the author desires. To elaborate, the reason I'm doing this is so I can. CSS-Tricks * is created, written by, and maintained by Chris Coyier and a team of swell people. This means that whatever we match much also have this pattern right before it, but the "before part" isn't part of the pattern we want to keep. However, in Java you can also use \1 in the match string to insist on a match for some expression found earlier in the string, i. , \!) to properly run the examples listed above, even within single quotes. Next, we shall see what happens if one of the parameters is a NULL. The above regular expression matches “alex”. I need help replacing my double quotes of my log file with single quotes. Replace Method. You can watch Perl's regular expression engine at work to verify for yourself if Perl is recompiling a regular expression. (This form is a kind of regular expression. I tested this and it works: [code. When using a regular expression or grep tool like PowerGREP or the search-and-replace function of a text editor like EditPad Pro, you should not escape or repeat the quote characters like you do in a programming language. Then look right after the potential match and ensure there is a double-quote after it, but do not include that double-quote in the match. It returns a regular expression that contains any character between s and t. This is where backreferences come in (we need to reference what was matched at the start in order to tell the engine what to look for). The tables are not exhaustive, for two reasons. Reply With Quote. For example, in Perl:. Strings are enclosed within a pair of double quotes. 60 2002/05/19 04:55:46 mac Exp$ ;; Copyright (C) 2001 Free. [^aeiou] Matches any single character not in the specified set of characters. Rate this: Please Sign up or sign in to vote. The author-supplied title is also used as a "classes" attribute value after being converted into a valid identifier form (down-cased; non-alphanumeric characters converted to single hyphens; "admonition-" prefixed). The benchmark showed the following performance difference:. I have written following lines of code but not working for removing single quote. That uses a simple regular expression to change every double quote to a single quote. "Hotel "ABC""); Since there is no escape character for "normal" characters but for example. Because the only other online tool I could find for testing. Some languages, for example, allow the use of either a single quote (') or a double quote (") to specify a string literal. There is also fixed = TRUE which can be considered to use a literal regular expression. i got problem while reading the following string. So, everytime the string is generated I've to find for ' and add another ' wherever it is in that string. That means to match a literal \ you need to write "\\\\" — you need four backslashes to match one!. Escaping Characters in Perl. to remove the need to double up any single quotes. split() Tag(s): String/Number. A character is represented as a single character string. I work in Production Support Environment and use this very often. Captures from the begin pattern can be referenced in the end pattern by using normal regular expression back-references. Escapes or unescapes an HTML file removing traces of offending characters that could be wrongfully interpreted as markup. Quoted strings use Go syntax and are evaluated before execution; a quoted string appears as a single argument to the generator. Single quotes in oracle are escaped not as \' (backslash-quote) but as '' (two single quotes) So if there are double quotes, you can get it into database without replacement. How to insert strings containing quotes into the database? use two single quotes next to each other to include a single quote in a string. But I usually add something to make sure I'm not spanning accross multiple quoted strings in a single match, and to accomodate double-double quote escapes:. The solution is to either use multiple patterns and write some custom logic, use a regular expression library like lrexlib or Lua PCRE, or use LPeg. RegexMagic itself comes with the same documentation as a context-sensitive help file. the same function name is used with different numbers and types of arguments. Last released: Oct 28, 2019 The uncompromising code formatter. the double quotes will prevent OH from being able to parse the value into a Number. Therefore compound double quotes " "' must be used as delimiters. Single regular expression for parsing Python single or double-quoted strings while preserving any escaped quote characters - parse_python_quoted_strings. [0-9a-fA-F]. Note that re2's regular expression syntax differs from PCRE and Ruby's built-in Regexp library, see the official syntax page for more details. Besides the single and double-quotes, Perl also allows you to use quote-like operators such as:. I did a cut&paste of the one liner in your gist inside my tests and most of the tests fail. (This form is a kind of regular expression. So ain't is valid but ain't will remove the first quote. What regex will be needed to remove the double quotes and leave single quotes in place? splunk-enterprise regex double-quote single-quote featured · answered Mar 1, '18 by somesoni2 ♦ 134k. The jrestore can be controlled to restore from any file type on the backup, from single records to multiple directories. a] Enclosing characters in single quotes preserves the literal value of each character within the quotes b] Enclosing characters in double quotes preserves the literal value of all characters within the quotes, with the exception of â€˜$â€™, â€˜â€™, â€˜\â€™, and, when history expansion is enabled, â€˜!â€™. The Visual Studio IDE supports searching and replacing with regular expressions, right?Sure it does. The PowerShell escape character is the grave-accent() The escape character can be used in three ways: 1) When used at the end of a line, it is a continuation character - so the command will continue on the next line. tf = ~cellfun('isempty',matches); newStr = str(tf). Table 12-1 gives a brief description of each regular expression function. Table of Contents. partial quoting [double quote] "STRING" preserves (from interpretation) most of the special characters within STRING. When the match is extended, its starting position is allowed to occur before LIMIT. The interpreter groups everything until another double quote is found, including newlines and semicolons. From: Subject: =?utf-8?B?QnVsZ2FyaXN0YW4sIEFLUCdsaSBBeml6IEJhYnXFn8OndSd5YSAnZ2lyacWfIHlhc2HEn8SxJyBrb3lkdSAtIEN1bWh1cml5ZXQgVMO8cmtpeWUgSGFiZXJsZXJp?= Date: Fri, 14. If you debug this regular expression with RegexBuddy, you'll instantly notice that the combination of "any character" (i. A list of comma delimited "pattern":"replacement" pairs. The choice between single or double quotes is only important if the search string contains variables or other items that you expect to be evaluated. BigQuery's regular expression functions can be used to filter results in a WHERE clause, as well as to display results in the SELECT. I'm doing some write-javascript-to-head in a server function, which works just fine right now. Here, we use a raw string, and we chose to delimit it with single-quotes so we don't need to escape the internal double-quotes. Regular expression examples. Special care must be taken with the expression pattern. You need the \\ because the expression between tour quotes is interpreted twice: once and first as a character string (in which \( is illegal but \\ is legal) and then as a regular expression in which you want to match a literal ( and ) which must be escaped in the regular expression since they are meta characters. Echo just the date from the following string. B -nodepage By default,. Therefore compound double quotes `" "' must be used as delimiters. Index: mutt/ChangeLog diff -u mutt/ChangeLog:3. el 10408 2007-03-16 19:02:09Z baltus$ ;;; ;;;;; ;; bsv-mode. The regular expression that can parse these lines is quite complex, so I'll split it for your convenience:. The basic word unit in regular expressions is a letter, digit, or underscore (the \w metacharacter) surrounded by space characters, or the beginning or end of the string.