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  2. JavaScript syntax - Wikipedia

    en.wikipedia.org/wiki/JavaScript_syntax

    5.5 Regular expression. 5.5.1 Character classes. 5.5.2 ... which is the largest number JavaScript can reliably represent with the Number primitive and represented by ...

  3. Regular expression - Wikipedia

    en.wikipedia.org/wiki/Regular_expression

    A regular expression (shortened as regex or regexp), [1] sometimes referred to as rational expression, [2] [3] is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings , or for input validation .

  4. Comparison of regular expression engines - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_regular...

    Regular Expression Flavor Comparison – Detailed comparison of the most popular regular expression flavors; Regexp Syntax Summary; Online Regular Expression Testing – with support for Java, JavaScript, .Net, PHP, Python and Ruby; Implementing Regular Expressions – series of articles by Russ Cox, author of RE2; Regular Expression Engines

  5. Help:Searching/Features - Wikipedia

    en.wikipedia.org/wiki/Help:Searching/Features

    The search engine limits the number of regexp searches that can run at once. Without the proper filter running alongside a regexp it will run for up to twenty seconds, and then incur an HTML timeout. On the search results page, the initial search domain on which the query was run is indicated by the following, given in increasing power to ...

  6. Category:Regular expressions - Wikipedia

    en.wikipedia.org/wiki/Category:Regular_expressions

    Pages in category "Regular expressions" The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes. ...

  7. User:Cacycle/wikEd help - Wikipedia

    en.wikipedia.org/wiki/User:Cacycle/wikEd_help

    RegExp: Toggle the regular expression search setting. The JavaScript regular expression syntax is used. In the replace text the following placeholders can be used: $1, $2... (to reference parenthesized substring matches), \n (newline), \r (return), \t (tab), \127 (octal char), \x1f (hexadecimal ASCII char), and \u12ef (hexadecimal Unicode char

  8. Help:Searching - Wikipedia

    en.wikipedia.org/wiki/Help:Searching

    insource:/regexp/ insource:/regexp/i: These are regular expressions. They use a lot of processing power, so we can only allow a few at a time on the search cluster, but they are very powerful. The version with the extra i runs the expression case-insensitive, and is even less efficient. Regex searches are likely to time out unless you further ...

  9. Parsing expression grammar - Wikipedia

    en.wikipedia.org/wiki/Parsing_expression_grammar

    A parsing expression is a kind of pattern that each string may either match or not match.In case of a match, there is a unique prefix of the string (which may be the whole string, the empty string, or something in between) which has been consumed by the parsing expression; this prefix is what one would usually think of as having matched the expression.