CVSROOT: /webcvs/grep Module name: grep Changes by: Jim Meyering <meyering> 23/03/22 22:55:22
Index: html_node/Special-Backslash-Expressions.html =================================================================== RCS file: /webcvs/grep/grep/manual/html_node/Special-Backslash-Expressions.html,v retrieving revision 1.1 retrieving revision 1.2 diff -u -b -r1.1 -r1.2 --- html_node/Special-Backslash-Expressions.html 3 Sep 2022 19:33:14 -0000 1.1 +++ html_node/Special-Backslash-Expressions.html 23 Mar 2023 02:55:21 -0000 1.2 @@ -1,11 +1,11 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd";> +<!DOCTYPE html> <html> -<!-- Created by GNU Texinfo 6.8, https://www.gnu.org/software/texinfo/ --> +<!-- Created by GNU Texinfo 7.0dev, https://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <!-- This manual is for grep, a pattern matching engine. -Copyright (C) 1999-2002, 2005, 2008-2022 Free Software Foundation, +Copyright © 1999-2002, 2005, 2008-2023 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document @@ -14,10 +14,10 @@ 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". --> -<title>Special Backslash Expressions (GNU Grep 3.8)</title> +<title>Special Backslash Expressions (GNU Grep 3.10)</title> -<meta name="description" content="Special Backslash Expressions (GNU Grep 3.8)"> -<meta name="keywords" content="Special Backslash Expressions (GNU Grep 3.8)"> +<meta name="description" content="Special Backslash Expressions (GNU Grep 3.10)"> +<meta name="keywords" content="Special Backslash Expressions (GNU Grep 3.10)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> @@ -31,21 +31,8 @@ <link href="Character-Classes-and-Bracket-Expressions.html" rel="prev" title="Character Classes and Bracket Expressions"> <style type="text/css"> <!-- -a.copiable-anchor {visibility: hidden; text-decoration: none; line-height: 0em} -a.summary-letter {text-decoration: none} -blockquote.indentedblock {margin-right: 0em} -div.display {margin-left: 3.2em} -div.example {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} -span.nolinebreak {white-space: nowrap} -span.roman {font-family: initial; font-weight: normal} -span.sansserif {font-family: sans-serif; font-weight: normal} -span:hover a.copiable-anchor {visibility: visible} -ul.no-bullet {list-style: none} +a.copiable-link {visibility: hidden; text-decoration: none; line-height: 0em} +span:hover a.copiable-link {visibility: visible} --> </style> <link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css";> @@ -54,70 +41,70 @@ </head> <body lang="en"> -<div class="section" id="Special-Backslash-Expressions"> -<div class="header"> +<div class="section-level-extent" id="Special-Backslash-Expressions"> +<div class="nav-panel"> <p> Next: <a href="Anchoring.html" accesskey="n" rel="next">Anchoring</a>, Previous: <a href="Character-Classes-and-Bracket-Expressions.html" accesskey="p" rel="prev">Character Classes and Bracket Expressions</a>, Up: <a href="Regular-Expressions.html" 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" title="Index" rel="index">Index</a>]</p> </div> <hr> -<span id="Special-Backslash-Expressions-1"></span><h3 class="section">3.3 Special Backslash Expressions</h3> -<span id="index-backslash"></span> +<h3 class="section" id="Special-Backslash-Expressions-1"><span>3.3 Special Backslash Expressions<a class="copiable-link" href="#Special-Backslash-Expressions-1"> ¶</a></span></h3> +<a class="index-entry-id" id="index-backslash"></a> -<p>The ‘<samp>\</samp>’ character followed by a special character is a regular +<p>The ‘<samp class="samp">\</samp>’ character followed by a special character is a regular expression that matches the special character. -The ‘<samp>\</samp>’ character, +The ‘<samp class="samp">\</samp>’ character, when followed by certain ordinary characters, takes a special meaning: </p> -<dl compact="compact"> -<dt><span>‘<samp>\b</samp>’</span></dt> +<dl class="table"> +<dt>‘<samp class="samp">\b</samp>’</dt> <dd><p>Match the empty string at the edge of a word. </p> </dd> -<dt><span>‘<samp>\B</samp>’</span></dt> +<dt>‘<samp class="samp">\B</samp>’</dt> <dd><p>Match the empty string provided it’s not at the edge of a word. </p> </dd> -<dt><span>‘<samp>\<</samp>’</span></dt> +<dt>‘<samp class="samp">\<</samp>’</dt> <dd><p>Match the empty string at the beginning of a word. </p> </dd> -<dt><span>‘<samp>\></samp>’</span></dt> +<dt>‘<samp class="samp">\></samp>’</dt> <dd><p>Match the empty string at the end of a word. </p> </dd> -<dt><span>‘<samp>\w</samp>’</span></dt> -<dd><p>Match word constituent, it is a synonym for ‘<samp>[_[:alnum:]]</samp>’. +<dt>‘<samp class="samp">\w</samp>’</dt> +<dd><p>Match word constituent, it is a synonym for ‘<samp class="samp">[_[:alnum:]]</samp>’. </p> </dd> -<dt><span>‘<samp>\W</samp>’</span></dt> -<dd><p>Match non-word constituent, it is a synonym for ‘<samp>[^_[:alnum:]]</samp>’. +<dt>‘<samp class="samp">\W</samp>’</dt> +<dd><p>Match non-word constituent, it is a synonym for ‘<samp class="samp">[^_[:alnum:]]</samp>’. </p> </dd> -<dt><span>‘<samp>\s</samp>’</span></dt> -<dd><p>Match whitespace, it is a synonym for ‘<samp>[[:space:]]</samp>’. +<dt>‘<samp class="samp">\s</samp>’</dt> +<dd><p>Match whitespace, it is a synonym for ‘<samp class="samp">[[:space:]]</samp>’. </p> </dd> -<dt><span>‘<samp>\S</samp>’</span></dt> -<dd><p>Match non-whitespace, it is a synonym for ‘<samp>[^[:space:]]</samp>’. +<dt>‘<samp class="samp">\S</samp>’</dt> +<dd><p>Match non-whitespace, it is a synonym for ‘<samp class="samp">[^[:space:]]</samp>’. </p> </dd> -<dt><span>‘<samp>\]</samp>’</span></dt> -<dd><p>Match ‘<samp>]</samp>’. +<dt>‘<samp class="samp">\]</samp>’</dt> +<dd><p>Match ‘<samp class="samp">]</samp>’. </p> </dd> -<dt><span>‘<samp>\}</samp>’</span></dt> -<dd><p>Match ‘<samp>}</samp>’. +<dt>‘<samp class="samp">\}</samp>’</dt> +<dd><p>Match ‘<samp class="samp">}</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>For example, ‘<samp class="samp">\brat\b</samp>’ matches the separate word ‘<samp class="samp">rat</samp>’, +‘<samp class="samp">\Brat\B</samp>’ matches ‘<samp class="samp">crate</samp>’ but not ‘<samp class="samp">furry rat</samp>’. </p> -<p>The behavior of <code>grep</code> is unspecified if a unescaped backslash +<p>The behavior of <code class="command">grep</code> is unspecified if a unescaped backslash is not followed by a special character, a nonzero digit, or a -character in the above list. Although <code>grep</code> might issue a +character in the above list. Although <code class="command">grep</code> might issue a diagnostic and/or give the backslash an interpretation now, its behavior may change if the syntax of regular expressions is extended in future versions.
