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Changes to manual/html_node/The-Backslash-Character-and-Special-Expressi
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From: |
Karl Berry |
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Subject: |
Changes to manual/html_node/The-Backslash-Character-and-Special-Expressions.html |
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Date: |
Sun, 24 May 2009 18:43:11 +0000 |
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>
+
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