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Changes to grep/manual/html_node/Regular-Expressions.html,v
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From: |
Jim Meyering |
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Subject: |
Changes to grep/manual/html_node/Regular-Expressions.html,v |
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Date: |
Fri, 05 Feb 2016 00:45:05 +0000 |
CVSROOT: /webcvs/grep
Module name: grep
Changes by: Jim Meyering <meyering> 16/02/05 00:44:53
Index: html_node/Regular-Expressions.html
===================================================================
RCS file: /webcvs/grep/grep/manual/html_node/Regular-Expressions.html,v
retrieving revision 1.21
retrieving revision 1.22
diff -u -b -r1.21 -r1.22
--- html_node/Regular-Expressions.html 2 Nov 2015 02:54:36 -0000 1.21
+++ html_node/Regular-Expressions.html 5 Feb 2016 00:44:52 -0000 1.22
@@ -1,60 +1,83 @@
-<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>Regular Expressions - GNU Grep 2.22</title>
+<title>GNU Grep 2.23: Regular Expressions</title>
+
+<meta name="description" content="GNU Grep 2.23: Regular Expressions">
+<meta name="keywords" content="GNU Grep 2.23: Regular 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="prev" href="Invoking.html#Invoking" title="Invoking">
-<link rel="next" href="Usage.html#Usage" title="Usage">
-<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="index.html#Top" rel="up" title="Top">
+<link href="Fundamental-Structure.html#Fundamental-Structure" rel="next"
title="Fundamental Structure">
+<link href="grep-Programs.html#grep-Programs" rel="prev" title="grep Programs">
+<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="Regular-Expressions"></a>
+<div class="header">
<p>
-Next: <a rel="next" accesskey="n" href="Usage.html#Usage">Usage</a>,
-Previous: <a rel="previous" accesskey="p"
href="Invoking.html#Invoking">Invoking</a>,
-Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
-<hr>
+Next: <a href="Usage.html#Usage" accesskey="n" rel="next">Usage</a>, Previous:
<a href="Invoking.html#Invoking" accesskey="p" rel="prev">Invoking</a>, Up: <a
href="index.html#Top" accesskey="u" rel="up">Top</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="Regular-Expressions-1"></a>
<h2 class="chapter">3 Regular Expressions</h2>
+<a name="index-regular-expressions"></a>
-<p><a name="index-regular-expressions-192"></a>
-A <dfn>regular expression</dfn> is a pattern that describes a set of strings.
+<p>A <em>regular expression</em> is a pattern that describes a set of strings.
Regular expressions are constructed analogously to arithmetic expressions,
by using various operators to combine smaller expressions.
-<samp><span class="command">grep</span></samp> understands
+<code>grep</code> understands
three different versions of regular expression syntax:
“basic,” (BRE) “extended” (ERE) and
“perl”.
-In GNU <samp><span class="command">grep</span></samp>,
+In GNU <code>grep</code>,
there is no difference in available functionality between the basic and
extended syntaxes.
In other implementations, basic regular expressions are less powerful.
@@ -62,16 +85,25 @@
differences for basic regular expressions are summarized afterwards.
Perl regular expressions give additional functionality, and are
documented in the <i>pcresyntax</i>(3) and <i>pcrepattern</i>(3) manual pages,
-but may not be available on every system.
+but work only if PCRE is available in the system.
+</p>
+<table class="menu" border="0" cellspacing="0">
+<tr><td align="left" valign="top">• <a
href="Fundamental-Structure.html#Fundamental-Structure"
accesskey="1">Fundamental Structure</a>:</td><td> </td><td
align="left" valign="top">
+</td></tr>
+<tr><td align="left" valign="top">• <a
href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions"
accesskey="2">Character Classes and Bracket
Expressions</a>:</td><td> </td><td align="left" valign="top">
+</td></tr>
+<tr><td align="left" valign="top">• <a
href="The-Backslash-Character-and-Special-Expressions.html#The-Backslash-Character-and-Special-Expressions"
accesskey="3">The Backslash Character and Special
Expressions</a>:</td><td> </td><td align="left" valign="top">
+</td></tr>
+<tr><td align="left" valign="top">• <a href="Anchoring.html#Anchoring"
accesskey="4">Anchoring</a>:</td><td> </td><td align="left"
valign="top">
+</td></tr>
+<tr><td align="left" valign="top">• <a
href="Back_002dreferences-and-Subexpressions.html#Back_002dreferences-and-Subexpressions"
accesskey="5">Back-references and
Subexpressions</a>:</td><td> </td><td align="left" valign="top">
+</td></tr>
+<tr><td align="left" valign="top">• <a
href="Basic-vs-Extended.html#Basic-vs-Extended" accesskey="6">Basic vs
Extended</a>:</td><td> </td><td align="left" valign="top">
+</td></tr>
+</table>
+
-<ul class="menu">
-<li><a accesskey="1"
href="Fundamental-Structure.html#Fundamental-Structure">Fundamental
Structure</a>
-<li><a accesskey="2"
href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions">Character
Classes and Bracket Expressions</a>
-<li><a accesskey="3"
href="The-Backslash-Character-and-Special-Expressions.html#The-Backslash-Character-and-Special-Expressions">The
Backslash Character and Special Expressions</a>
-<li><a accesskey="4" href="Anchoring.html#Anchoring">Anchoring</a>
-<li><a accesskey="5"
href="Back_002dreferences-and-Subexpressions.html#Back_002dreferences-and-Subexpressions">Back-references
and Subexpressions</a>
-<li><a accesskey="6" href="Basic-vs-Extended.html#Basic-vs-Extended">Basic vs
Extended</a>
-</ul>
- </body></html>
+</body>
+</html>
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