This allows you to use the "\K" escape in your regexes, which fools the regex engine into thinking it has only just started matching your regex. This means you can turn the inefficient replace-with-itself construct s/(save)delete/$1/; into the more e...

This module is intended to test your regular expressions. Given a subject string and a regular expression (aka pattern), the module not only tests whether the regular expression complete matches the subject string, it performs a "utf8::upgrade" or "u...

This module uses the regex engine to generate the strings that a given regex would match. Some ideas for uses: Test and debug your regex. Generate test data. Generate combinations. Generate data according to a lexical pattern (urls, etc) Edit the reg...

By default, this module exports a single hash (%RE) that stores or generates commonly needed regular expressions (see "List of available patterns"). There is an alternative, subroutine-based syntax described in "Subroutine-based interface". General s...

This module holds the init() method for the Regexp::Parser class, which installs all the handlers for standard Perl 5 regexes. This documentation contains a sub-classing tutorial....

Markup languages, like HTML, are difficult to parse. The reason is that you can have a line like: <font size=+1>H</font>ello <font size=+1>W</font>orld How can we find the string "Hello World", in the above line, and replace it by "Hello Universe" (w...

This module parses regular expressions (regexes). Its default "grammar" is Perl 5.8.4's regex set. Grammar is quoted because the module does not so much define a grammar as let each matched node state what it expects to match next, but there is not c...

Regexp::Assemble takes an arbitrary number of regular expressions and assembles them into a single regular expression (or RE) that matches all that the individual REs match. As a result, instead of having a large list of expressions to loop over, a t...

This module adds a small number of new regex constructs that can be used within Perl 5.10 patterns to implement complete recursive-descent parsing. Perl 5.10 already supports recursive=descent *matching*, via the new "(?<name>...)" and "(?&name)" con...

In many situations, users may want to specify patterns to match but don't need the full power of regexps. Wildcards make one of those sets of simplified rules. This module converts wildcard expressions to Perl regular expressions, so that you can use...

Patterns for the following URIs are supported: fax, file, FTP, gopher, HTTP, news, NTTP, pop, prospero, tel, telnet, tv and WAIS. Each is documented in the *Regexp::Common::URI::scheme*, manual page, for the appropriate scheme (in lowercase), except ...

Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via *Regexp::Common*. $RE{SEN}{USA}{SSN}{-sep} Returns a pattern that matches an American Social Securi...

Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via *Regexp::Common*. This modules gives you regular expressions for various style IPv4, IPv6, and MAC ...

Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via *Regexp::Common*. This module offers patterns for zip or postal codes of many different countries. ...

Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via *Regexp::Common*. $RE{list}{-pat}{-sep}{-lastsep} Returns a pattern matching a list of (at least tw...

This module creates regular expressions that can be used for parsing dates and times. See Regexp::Common for a general description of how to use this interface. Parsing dates is a dirty business. Dates are generally specified in one of three possible...

This module is regexps matching filenames used by Emacs. They're designed to operate only on the filename without a directory part, so foo.txt good /dir/foo.txt bad Basename-only is because the directory and/or volume part is system dependent and bes...