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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 .
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
5.5 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 ...
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 ...
HTML, CSS, JavaScript, C++: No cost: MIT: BBEdit: Rich Siegel 1992 ... Multi-line regex support Search in files Large file support: = Larger than 4 GiB 2 ...
A metacharacter is a character that has a special meaning to a computer program, such as a shell interpreter or a regular expression (regex) engine.. In POSIX extended regular expressions, there are 14 metacharacters that must be escaped — preceded by a backslash (\) — in order to drop their special meaning and be treated literally inside an expression: opening and closing square brackets ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 18 January 2025. High-level programming language Not to be confused with Java (programming language), Javanese script, or ECMAScript. JavaScript Screenshot of JavaScript source code Paradigm Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented Designed by Brendan Eich of ...
A regular expression denial of service ... is the number of states in the ... benchmark for regular expression DoS in JavaScript". Retrieved 2010-04-19. ...