CVSROOT: /web/grep Module name: grep Changes by: Karl Berry <karl> 09/05/24 18:43:01
Index: manual/html_node/The-Backslash-Character-and-Special-Expressions.html =================================================================== RCS file: manual/html_node/The-Backslash-Character-and-Special-Expressions.html diff -N manual/html_node/The-Backslash-Character-and-Special-Expressions.html --- /dev/null 1 Jan 1970 00:00:00 -0000 +++ manual/html_node/The-Backslash-Character-and-Special-Expressions.html 24 May 2009 18:43:00 -0000 1.1 @@ -0,0 +1,74 @@ +<html lang="en"> +<head> +<title>The Backslash Character and Special Expressions - GNU Grep 2.5.4</title> +<meta http-equiv="Content-Type" content="text/html"> +<meta name="description" content="GNU Grep 2.5.4"> +<meta name="generator" content="makeinfo 4.13"> +<link title="Top" rel="start" href="index.html#Top"> +<link rel="up" href="Regular-Expressions.html#Regular-Expressions" title="Regular Expressions"> +<link rel="prev" href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions" title="Character Classes and Bracket Expressions"> +<link rel="next" href="Anchoring.html#Anchoring" title="Anchoring"> +<link href="http://www.gnu.org/software/texinfo/"; rel="generator-home" title="Texinfo Homepage"> +<!-- +This manual is for `grep', a pattern matching engine. + +Copyright (C) 1999, 2000, 2001, 2002, 2005, 2008, 2009 Free +Software Foundation, Inc. + + Permission is granted to copy, distribute and/or modify this + document under the terms of the GNU Free Documentation License, + Version 1.3 or any later version published by the Free Software + Foundation; with no Invariant Sections, with no Front-Cover Texts, + and with no Back-Cover Texts. A copy of the license is included + in the section entitled ``GNU Free Documentation License''. + --> +<meta http-equiv="Content-Style-Type" content="text/css"> +<style type="text/css"><!-- + pre.display { font-family:inherit } + pre.format { font-family:inherit } + pre.smalldisplay { font-family:inherit; font-size:smaller } + pre.smallformat { font-family:inherit; font-size:smaller } + pre.smallexample { font-size:smaller } + pre.smalllisp { font-size:smaller } + span.sc { font-variant:small-caps } + span.roman { font-family:serif; font-weight:normal; } + span.sansserif { font-family:sans-serif; font-weight:normal; } +--></style> +</head> +<body> +<div class="node"> +<a name="The-Backslash-Character-and-Special-Expressions"></a> +<p> +Next: <a rel="next" accesskey="n" href="Anchoring.html#Anchoring">Anchoring</a>, +Previous: <a rel="previous" accesskey="p" href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions">Character Classes and Bracket Expressions</a>, +Up: <a rel="up" accesskey="u" href="Regular-Expressions.html#Regular-Expressions">Regular Expressions</a> +<hr> +</div> + +<h3 class="section">3.3 The Backslash Character and Special Expressions</h3> + +<p><a name="index-backslash-235"></a> +The ‘<samp><span class="samp">\</span></samp>’ character, +when followed by certain ordinary characters, +takes a special meaning: + + <dl> +<dt>‘<samp><span class="samp">‘</span><samp><span class="samp">\b</span></samp><span class="samp">’</span></samp>’<dd>Match the empty string at the edge of a word. + + <br><dt>‘<samp><span class="samp">‘</span><samp><span class="samp">\B</span></samp><span class="samp">’</span></samp>’<dd>Match the empty string provided it's not at the edge of a word. + + <br><dt>‘<samp><span class="samp">‘</span><samp><span class="samp">\<</span></samp><span class="samp">’</span></samp>’<dd>Match the empty string at the beginning of word. + + <br><dt>‘<samp><span class="samp">‘</span><samp><span class="samp">\></span></samp><span class="samp">’</span></samp>’<dd>Match the empty string at the end of word. + + <br><dt>‘<samp><span class="samp">‘</span><samp><span class="samp">\w</span></samp><span class="samp">’</span></samp>’<dd>Match word constituent, it is a synonym for ‘<samp><span class="samp">[[:alnum:]]</span></samp>’. + + <br><dt>‘<samp><span class="samp">‘</span><samp><span class="samp">\W</span></samp><span class="samp">’</span></samp>’<dd>Match non-word constituent, it is a synonym for ‘<samp><span class="samp">[^[:alnum:]]</span></samp>’. + + </dl> + + <p>For example, ‘<samp><span class="samp">\brat\b</span></samp>’ matches the separate word ‘<samp><span class="samp">rat</span></samp>’, +‘<samp><span class="samp">\Brat\B</span></samp>’ matches ‘<samp><span class="samp">crate</span></samp>’ but not ‘<samp><span class="samp">furry rat</span></samp>’. + + </body></html> +
