Search results
Results From The WOW.Com Content Network
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
Greed, in regular expression context, describes the number of characters which will be matched (often also stated as "consumed") by a variable length portion of a regular expression – a token or group followed by a quantifier, which specifies a number (or range of numbers) of tokens. If the portion of the regular expression is "greedy", it ...
Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are supported in many programming languages. Library implementations are often called an "engine", [4] [5] and many of these are ...
The RE2 algorithm has been rewritten in Rust as the package "regex". CloudFlare's web application firewall uses this package because the RE2 algorithm is immune to ReDoS. [8] Russ Cox also wrote RE1, an earlier regular expression based on a bytecode interpreter. [9] OpenResty uses a RE1 fork called "sregex". [10]
The following may seem trivial for Unix-experienced people, but a collection of ready-to-use regular expressions can help people who don't know anything or much about regular expressions. For these people: You can use regular expressions in many editors to perform complex editing tasks. This will give the headings more (or fewer) equal signs (=).
Although transformational languages are typically best suited for transformation, something as simple as regular expressions can be used to achieve useful transformation. A text editor like vim, emacs or TextPad supports the use of regular expressions with arguments. This would allow all instances of a particular pattern to be replaced with ...
User scripts, a collection of JavaScript routines that add functionality to Wikipedia pages (e.g., regex search and replace, changing article formatting, and simplifying common tasks) WatchlistBot is a bot that delivers realtime alerts via instant message when watched articles are edited or when watched users or IP networks edit.
Substitution commands are of the form s/regexp/replacement/, where regexp is a regular expression, for parsing input, and replacement is a simple template for output, either literal text, or a format string containing the characters & for "entire match" or the special escape sequences \1 through \9 for the nth sub-expression.