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Regular Expressions

A regular expression, or regexp for short, is a pattern that denotes a (possibly infinite) set of strings. Searching for matches for a regexp is a very powerful operation. This section explains how to write regexps; the following section says how to search for them.

For interactive development of regular expressions, you can use the M-x re-builder command. It provides a convenient interface for creating regular expressions, by giving immediate visual feedback in a separate buffer. As you edit the regexp, all its matches in the target buffer are highlighted. Each parenthesized sub-expression of the regexp is shown in a distinct face, which makes it easier to verify even very complex regexps.

Note that by default Emacs search ignores case (see Searching and Case). To enable case-sensitive regexp search and match, bind case-fold-search to nil around the code you want to be case-sensitive.

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• Syntax of Regexps - Rules for writing regular expressions.
• Regexp Example - Illustrates regular expression syntax.
• Rx Notation - An alternative, structured regexp notation.
• Regexp Functions - Functions for operating on regular expressions.
• Regexp Problems - Some problems and how they may be avoided.
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- Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc.
Licensed under the GNU GPL license.
- https://www.gnu.org/software/emacs/manual/html_node/elisp/Regular-Expressions.html -

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