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Changes to grep/manual/html_node/Back_002dreferences-and-Subexpressions.
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From: |
Jim Meyering |
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Subject: |
Changes to grep/manual/html_node/Back_002dreferences-and-Subexpressions.html, v |
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Date: |
Fri, 05 Feb 2016 00:44:58 +0000 |
CVSROOT: /webcvs/grep
Module name: grep
Changes by: Jim Meyering <meyering> 16/02/05 00:44:53
Index: html_node/Back_002dreferences-and-Subexpressions.html
===================================================================
RCS file:
/webcvs/grep/grep/manual/html_node/Back_002dreferences-and-Subexpressions.html,v
retrieving revision 1.21
retrieving revision 1.22
diff -u -b -r1.21 -r1.22
--- html_node/Back_002dreferences-and-Subexpressions.html 2 Nov 2015
02:54:31 -0000 1.21
+++ html_node/Back_002dreferences-and-Subexpressions.html 5 Feb 2016
00:44:50 -0000 1.22
@@ -1,66 +1,91 @@
-<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>Back-references and Subexpressions - GNU Grep 2.22</title>
+<title>GNU Grep 2.23: Back-references and Subexpressions</title>
+
+<meta name="description" content="GNU Grep 2.23: Back-references and
Subexpressions">
+<meta name="keywords" content="GNU Grep 2.23: Back-references and
Subexpressions">
+<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="Anchoring.html#Anchoring" title="Anchoring">
-<link rel="next" href="Basic-vs-Extended.html#Basic-vs-Extended" title="Basic
vs Extended">
-<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="Basic-vs-Extended.html#Basic-vs-Extended" rel="next" title="Basic
vs Extended">
+<link href="Anchoring.html#Anchoring" rel="prev" title="Anchoring">
+<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}
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+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}
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+span.nocodebreak {white-space: nowrap}
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+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 }
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- 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">
-<a name="Back-references-and-Subexpressions"></a>
+
+<body lang="en">
<a name="Back_002dreferences-and-Subexpressions"></a>
+<div class="header">
<p>
-Next: <a rel="next" accesskey="n"
href="Basic-vs-Extended.html#Basic-vs-Extended">Basic vs Extended</a>,
-Previous: <a rel="previous" accesskey="p"
href="Anchoring.html#Anchoring">Anchoring</a>,
-Up: <a rel="up" accesskey="u"
href="Regular-Expressions.html#Regular-Expressions">Regular Expressions</a>
-<hr>
+Next: <a href="Basic-vs-Extended.html#Basic-vs-Extended" accesskey="n"
rel="next">Basic vs Extended</a>, Previous: <a href="Anchoring.html#Anchoring"
accesskey="p" rel="prev">Anchoring</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="Back_002dreferences-and-Subexpressions-1"></a>
<h3 class="section">3.5 Back-references and Subexpressions</h3>
+<a name="index-subexpression"></a>
+<a name="index-back_002dreference"></a>
-<p><a name="index-subexpression-251"></a><a
name="index-back_002dreference-252"></a>
-The back-reference ‘<samp><span
class="samp">\</span><var>n</var></samp>’, where <var>n</var> is a single
digit, matches
+<p>The back-reference ‘<samp>\<var>n</var></samp>’, where
<var>n</var> is a single digit, matches
the substring previously matched by the <var>n</var>th parenthesized
subexpression
of the regular expression.
-For example, ‘<samp><span class="samp">(a)\1</span></samp>’
matches ‘<samp><span class="samp">aa</span></samp>’.
+For example, ‘<samp>(a)\1</samp>’ matches
‘<samp>aa</samp>’.
When used with alternation, if the group does not participate in the match then
the back-reference makes the whole match fail.
-For example, ‘<samp><span class="samp">a(.)|b\1</span></samp>’
-will not match ‘<samp><span class="samp">ba</span></samp>’.
+For example, ‘<samp>a(.)|b\1</samp>’
+will not match ‘<samp>ba</samp>’.
When multiple regular expressions are given with
-<samp><span class="option">-e</span></samp> or from a file (‘<samp><span
class="samp">-f </span><var>file</var></samp>’),
+<samp>-e</samp> or from a file (‘<samp>-f <var>file</var></samp>’),
back-references are local to each expression.
+</p>
+
- </body></html>
+</body>
+</html>
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