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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: |
Wed, 22 Mar 2023 22:55:25 -0400 (EDT) |
CVSROOT: /webcvs/grep
Module name: grep
Changes by: Jim Meyering <meyering> 23/03/22 22:55:22
Index: html_node/Back_002dreferences-and-Subexpressions.html
===================================================================
RCS file:
/webcvs/grep/grep/manual/html_node/Back_002dreferences-and-Subexpressions.html,v
retrieving revision 1.33
retrieving revision 1.34
diff -u -b -r1.33 -r1.34
--- html_node/Back_002dreferences-and-Subexpressions.html 3 Sep 2022
19:33:14 -0000 1.33
+++ html_node/Back_002dreferences-and-Subexpressions.html 23 Mar 2023
02:55:20 -0000 1.34
@@ -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>Back-references and Subexpressions (GNU Grep 3.8)</title>
+<title>Back-references and Subexpressions (GNU Grep 3.10)</title>
-<meta name="description" content="Back-references and Subexpressions (GNU Grep
3.8)">
-<meta name="keywords" content="Back-references and Subexpressions (GNU Grep
3.8)">
+<meta name="description" content="Back-references and Subexpressions (GNU Grep
3.10)">
+<meta name="keywords" content="Back-references and Subexpressions (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="Anchoring.html" rel="prev" title="Anchoring">
<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";>
@@ -54,32 +41,32 @@
</head>
<body lang="en">
-<div class="section" id="Back_002dreferences-and-Subexpressions">
-<div class="header">
+<div class="section-level-extent" id="Back_002dreferences-and-Subexpressions">
+<div class="nav-panel">
<p>
Next: <a href="Basic-vs-Extended.html" accesskey="n" rel="next">Basic vs
Extended Regular Expressions</a>, Previous: <a href="Anchoring.html"
accesskey="p" rel="prev">Anchoring</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="Back_002dreferences-and-Subexpressions-1"></span><h3
class="section">3.5 Back-references and Subexpressions</h3>
-<span id="index-subexpression"></span>
-<span id="index-back_002dreference"></span>
-
-<p>The back-reference ‘<samp>\<var>n</var></samp>’,
-where <var>n</var> is a single nonzero digit, matches
-the substring previously matched by the <var>n</var>th parenthesized
subexpression
+<h3 class="section" id="Back_002dreferences-and-Subexpressions-1"><span>3.5
Back-references and Subexpressions<a class="copiable-link"
href="#Back_002dreferences-and-Subexpressions-1"> ¶</a></span></h3>
+<a class="index-entry-id" id="index-subexpression"></a>
+<a class="index-entry-id" id="index-back_002dreference"></a>
+
+<p>The back-reference ‘<samp class="samp">\<var
class="var">n</var></samp>’,
+where <var class="var">n</var> is a single nonzero digit, matches
+the substring previously matched by the <var class="var">n</var>th
parenthesized subexpression
of the regular expression.
-For example, ‘<samp>(a)\1</samp>’ matches
‘<samp>aa</samp>’.
+For example, ‘<samp class="samp">(a)\1</samp>’ matches
‘<samp class="samp">aa</samp>’.
If the parenthesized subexpression does not participate in the match,
the back-reference makes the whole match fail;
-for example, ‘<samp>(a)*\1</samp>’ fails to match
‘<samp>a</samp>’.
+for example, ‘<samp class="samp">(a)*\1</samp>’ fails to match
‘<samp class="samp">a</samp>’.
If the parenthesized subexpression matches more than one substring,
the back-reference refers to the last matched substring;
-for example, ‘<samp>^(ab*)*\1$</samp>’ matches
‘<samp>ababbabb</samp>’ but not ‘<samp>ababbab</samp>’.
+for example, ‘<samp class="samp">^(ab*)*\1$</samp>’ matches
‘<samp class="samp">ababbabb</samp>’ but not ‘<samp
class="samp">ababbab</samp>’.
When multiple regular expressions are given with
-<samp>-e</samp> or from a file (‘<samp>-f <var>file</var></samp>’),
+<samp class="option">-e</samp> or from a file (‘<samp class="samp">-f
<var class="var">file</var></samp>’),
back-references are local to each expression.
</p>
-<p>See <a href="Known-Bugs.html">Known Bugs</a>, for some known problems with
back-references.
+<p>See <a class="xref" href="Known-Bugs.html">Known Bugs</a>, for some known
problems with back-references.
</p>
</div>
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