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An interactive Emacs tool to build a '''regexp''' (regular expression).

...regular''' and '''expression'''. It is the Emacs abbreviation for "regular expression". ...ions] in general. This article focuses on the Emacs Lisp implementation of regular expressions.

...st. To learn about [[regular expression]]s try {{Keys|C-h r}} and {{Keys|i regular TAB}}.

This symbolic expression reads as "Add 2 to 2". A symbolic expression contains atoms or other symbolic

...letter "a" on every row in that piece of text. You could write a [[regular expression]] to do the job, but let's assume you want to use a keyboard macro this tim

...ode>desktop-clear-preserve-buffers-regexp</code>, whose value is a regular expression matching the names of buffers not to kill.

=== Regular Expression Search === ; {{Keys|C-M-s expression}} : search regexp forward

where 'separators' is a regular expression describing where to split the string. 'separators' defaults to white-space (the replacement expression). By default '''replace-regexp''' replaces

...xp-history'' ''extended-command-history'' ''shell-command-history'' ''read-expression-history'' ...ip-preserved-p file-newer-than-file-p file-symlink-p file-directory-p file-regular-p file-truename file-chase-links file-modes file-nlinks file-attributes loc