CVSROOT: /webcvs/grep Module name: grep Changes by: Jim Meyering <meyering> 16/02/05 00:44:53
Index: html_node/The-Backslash-Character-and-Special-Expressions.html =================================================================== RCS file: /webcvs/grep/grep/manual/html_node/The-Backslash-Character-and-Special-Expressions.html,v retrieving revision 1.21 retrieving revision 1.22 diff -u -b -r1.21 -r1.22 --- html_node/The-Backslash-Character-and-Special-Expressions.html 2 Nov 2015 02:54:36 -0000 1.21 +++ html_node/The-Backslash-Character-and-Special-Expressions.html 5 Feb 2016 00:44:53 -0000 1.22 @@ -1,79 +1,120 @@ -<html lang="en"> +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<html> +<!-- This manual is for grep, a pattern matching engine. + +Copyright (C) 1999-2002, 2005, 2008-2016 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". --> +<!-- Created by GNU Texinfo 6.0, http://www.gnu.org/software/texinfo/ --> <head> -<title>The Backslash Character and Special Expressions - GNU Grep 2.22</title> +<title>GNU Grep 2.23: The Backslash Character and Special Expressions</title> + +<meta name="description" content="GNU Grep 2.23: The Backslash Character and Special Expressions"> +<meta name="keywords" content="GNU Grep 2.23: The Backslash Character and Special Expressions"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> -<meta name="description" content="GNU Grep 2.22"> -<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"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Index.html#Index" rel="index" title="Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Regular-Expressions.html#Regular-Expressions" rel="up" title="Regular Expressions"> +<link href="Anchoring.html#Anchoring" rel="next" title="Anchoring"> +<link href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions" rel="prev" title="Character Classes and Bracket Expressions"> +<style type="text/css"> <!-- -This manual is for `grep', a pattern matching engine. +a.summary-letter {text-decoration: none} +blockquote.indentedblock {margin-right: 0em} +blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smalllisp {margin-left: 3.2em} +kbd {font-style: oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space: nowrap} +span.nolinebreak {white-space: nowrap} +span.roman {font-family: serif; font-weight: normal} +span.sansserif {font-family: sans-serif; font-weight: normal} +ul.no-bullet {list-style: none} +--> +</style> +<link rel="stylesheet" type="text/css" href="/software/gnulib/manual.css"> -Copyright (C) 1999-2002, 2005, 2008-2015 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> -<link rel="stylesheet" type="text/css" href="/software/gnulib/manual.css"> </head> -<body> -<div class="node"> + +<body lang="en"> <a name="The-Backslash-Character-and-Special-Expressions"></a> +<div class="header"> <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> +Next: <a href="Anchoring.html#Anchoring" accesskey="n" rel="next">Anchoring</a>, Previous: <a href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions" accesskey="p" rel="prev">Character Classes and Bracket Expressions</a>, Up: <a href="Regular-Expressions.html#Regular-Expressions" accesskey="u" rel="up">Regular Expressions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p> </div> - +<hr> +<a name="The-Backslash-Character-and-Special-Expressions-1"></a> <h3 class="section">3.3 The Backslash Character and Special Expressions</h3> +<a name="index-backslash"></a> -<p><a name="index-backslash-249"></a> -The ‘<samp><span class="samp">\</span></samp>’ character, +<p>The ‘<samp>\</samp>’ character, when followed by certain ordinary characters, takes a special meaning: +</p> +<dl compact="compact"> +<dt>‘<samp>\b</samp>’</dt> +<dd><p>Match the empty string at the edge of a word. +</p> +</dd> +<dt>‘<samp>\B</samp>’</dt> +<dd><p>Match the empty string provided it’s not at the edge of a word. +</p> +</dd> +<dt>‘<samp>\<</samp>’</dt> +<dd><p>Match the empty string at the beginning of word. +</p> +</dd> +<dt>‘<samp>\></samp>’</dt> +<dd><p>Match the empty string at the end of word. +</p> +</dd> +<dt>‘<samp>\w</samp>’</dt> +<dd><p>Match word constituent, it is a synonym for ‘<samp>[_[:alnum:]]</samp>’. +</p> +</dd> +<dt>‘<samp>\W</samp>’</dt> +<dd><p>Match non-word constituent, it is a synonym for ‘<samp>[^_[:alnum:]]</samp>’. +</p> +</dd> +<dt>‘<samp>\s</samp>’</dt> +<dd><p>Match whitespace, it is a synonym for ‘<samp>[[:space:]]</samp>’. +</p> +</dd> +<dt>‘<samp>\S</samp>’</dt> +<dd><p>Match non-whitespace, it is a synonym for ‘<samp>[^[:space:]]</samp>’. +</p> +</dd> +</dl> + +<p>For example, ‘<samp>\brat\b</samp>’ matches the separate word ‘<samp>rat</samp>’, +‘<samp>\Brat\B</samp>’ matches ‘<samp>crate</samp>’ but not ‘<samp>furry rat</samp>’. +</p> - <dl> -<dt>‘<samp><span class="samp">\b</span></samp>’<dd>Match the empty string at the edge of a word. - - <br><dt>‘<samp><span class="samp">\B</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>’<dd>Match the empty string at the beginning of word. - - <br><dt>‘<samp><span class="samp">\></span></samp>’<dd>Match the empty string at the end of word. - - <br><dt>‘<samp><span class="samp">\w</span></samp>’<dd>Match word constituent, it is a synonym for ‘<samp><span class="samp">[_[:alnum:]]</span></samp>’. - - <br><dt>‘<samp><span class="samp">\W</span></samp>’<dd>Match non-word constituent, it is a synonym for ‘<samp><span class="samp">[^_[:alnum:]]</span></samp>’. - - <br><dt>‘<samp><span class="samp">\s</span></samp>’<dd>Match whitespace, it is a synonym for ‘<samp><span class="samp">[[:space:]]</span></samp>’. - - <br><dt>‘<samp><span class="samp">\S</span></samp>’<dd>Match non-whitespace, it is a synonym for ‘<samp><span class="samp">[^[:space:]]</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> +</body> +</html>
