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Changes to grep/manual/html_node/Fundamental-Structure.html,v
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From: |
Jim Meyering |
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Subject: |
Changes to grep/manual/html_node/Fundamental-Structure.html,v |
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Date: |
Sat, 14 Aug 2021 16:46:43 -0400 (EDT) |
CVSROOT: /webcvs/grep
Module name: grep
Changes by: Jim Meyering <meyering> 21/08/14 16:46:41
Index: html_node/Fundamental-Structure.html
===================================================================
RCS file: /webcvs/grep/grep/manual/html_node/Fundamental-Structure.html,v
retrieving revision 1.31
retrieving revision 1.32
diff -u -b -r1.31 -r1.32
--- html_node/Fundamental-Structure.html 28 Sep 2020 03:36:49 -0000
1.31
+++ html_node/Fundamental-Structure.html 14 Aug 2021 20:46:40 -0000
1.32
@@ -1,8 +1,11 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd";>
<html>
+<!-- Created by GNU Texinfo 6.8, 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, 2008-2020 Free Software Foundation,
+Copyright (C) 1999-2002, 2005, 2008-2021 Free Software Foundation,
Inc.
Permission is granted to copy, distribute and/or modify this document
@@ -11,128 +14,112 @@
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 6.5, http://www.gnu.org/software/texinfo/ -->
-<head>
-<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
-<title>Fundamental Structure (GNU Grep 3.5)</title>
+<title>Fundamental Structure (GNU Grep 3.7)</title>
-<meta name="description" content="Fundamental Structure (GNU Grep 3.5)">
-<meta name="keywords" content="Fundamental Structure (GNU Grep 3.5)">
+<meta name="description" content="Fundamental Structure (GNU Grep 3.7)">
+<meta name="keywords" content="Fundamental Structure (GNU Grep 3.7)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
-<link href="index.html#Top" rel="start" title="Top">
-<link href="Index.html#Index" rel="index" title="Index">
+<meta name="viewport" content="width=device-width,initial-scale=1">
+
+<link href="index.html" rel="start" title="Top">
+<link href="Index.html" 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="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions"
rel="next" title="Character Classes and Bracket Expressions">
-<link href="Regular-Expressions.html#Regular-Expressions" rel="prev"
title="Regular Expressions">
+<link href="Regular-Expressions.html" rel="up" title="Regular Expressions">
+<link href="Character-Classes-and-Bracket-Expressions.html" rel="next"
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}
-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}
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kbd {font-style: oblique}
pre.display {font-family: inherit}
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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}
-->
</style>
-<link rel="stylesheet" type="text/css" href="/software/gnulib/manual.css">
+<link rel="stylesheet" type="text/css"
href="https://www.gnu.org/software/gnulib/manual.css";>
</head>
<body lang="en">
-<a name="Fundamental-Structure"></a>
+<div class="section" id="Fundamental-Structure">
<div class="header">
<p>
-Next: <a
href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions"
accesskey="n" rel="next">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>
+Next: <a href="Character-Classes-and-Bracket-Expressions.html" accesskey="n"
rel="next">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>
-<a name="Fundamental-Structure-1"></a>
-<h3 class="section">3.1 Fundamental Structure</h3>
+<span id="Fundamental-Structure-1"></span><h3 class="section">3.1 Fundamental
Structure</h3>
-<p>The fundamental building blocks are the regular expressions that match
-a single character.
-Most characters, including all letters and digits,
-are regular expressions that match themselves.
-Any meta-character
-with special meaning may be quoted by preceding it with a backslash.
-</p>
-<a name="index-_002e"></a>
-<a name="index-dot"></a>
-<a name="index-period"></a>
+<span id="index-ordinary-characters"></span>
+<span id="index-special-characters"></span>
+<p>In regular expressions, the characters
‘<samp>.?*+{|()[\^$</samp>’ are
+<em>special characters</em> and have uses described below. All other
+characters are <em>ordinary characters</em>, and each ordinary character
+is a regular expression that matches itself.
+</p>
+<span id="index-_002e"></span>
+<span id="index-dot"></span>
+<span id="index-period"></span>
<p>The period ‘<samp>.</samp>’ matches any single character.
It is unspecified whether ‘<samp>.</samp>’ matches an encoding
error.
</p>
+<span id="index-interval-expressions"></span>
<p>A regular expression may be followed by one of several
-repetition operators:
+repetition operators; the operators beginning with ‘<samp>{</samp>’
+are called <em>interval expressions</em>.
</p>
<dl compact="compact">
-<dt>‘<samp>?</samp>’</dt>
-<dd><a name="index-_003f"></a>
-<a name="index-question-mark"></a>
-<a name="index-match-expression-at-most-once"></a>
-<p>The preceding item is optional and will be matched at most once.
-</p>
-</dd>
-<dt>‘<samp>*</samp>’</dt>
-<dd><a name="index-_002a"></a>
-<a name="index-asterisk"></a>
-<a name="index-match-expression-zero-or-more-times"></a>
-<p>The preceding item will be matched zero or more times.
-</p>
-</dd>
-<dt>‘<samp>+</samp>’</dt>
-<dd><a name="index-_002b"></a>
-<a name="index-plus-sign"></a>
-<a name="index-match-expression-one-or-more-times"></a>
-<p>The preceding item will be matched one or more times.
-</p>
-</dd>
-<dt>‘<samp>{<var>n</var>}</samp>’</dt>
-<dd><a name="index-_007bn_007d"></a>
-<a name="index-braces_002c-one-argument"></a>
-<a name="index-match-expression-n-times"></a>
+<dt id='index-_003f'><span>‘<samp>?</samp>’<a href='#index-_003f'
class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-question-mark"></span>
+<span id="index-match-expression-at-most-once"></span>
+<p>The preceding item is optional and is matched at most once.
+</p>
+</dd>
+<dt id='index-_002a'><span>‘<samp>*</samp>’<a href='#index-_002a'
class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-asterisk"></span>
+<span id="index-match-expression-zero-or-more-times"></span>
+<p>The preceding item is matched zero or more times.
+</p>
+</dd>
+<dt id='index-_002b'><span>‘<samp>+</samp>’<a href='#index-_002b'
class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-plus-sign"></span>
+<span id="index-match-expression-one-or-more-times"></span>
+<p>The preceding item is matched one or more times.
+</p>
+</dd>
+<dt id='index-_007bn_007d'><span>‘<samp>{<var>n</var>}</samp>’<a
href='#index-_007bn_007d' class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-braces_002c-one-argument"></span>
+<span id="index-match-expression-n-times"></span>
<p>The preceding item is matched exactly <var>n</var> times.
</p>
</dd>
-<dt>‘<samp>{<var>n</var>,}</samp>’</dt>
-<dd><a name="index-_007bn_002c_007d"></a>
-<a name="index-braces_002c-second-argument-omitted"></a>
-<a name="index-match-expression-n-or-more-times"></a>
+<dt
id='index-_007bn_002c_007d'><span>‘<samp>{<var>n</var>,}</samp>’<a
href='#index-_007bn_002c_007d' class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-braces_002c-second-argument-omitted"></span>
+<span id="index-match-expression-n-or-more-times"></span>
<p>The preceding item is matched <var>n</var> or more times.
</p>
</dd>
-<dt>‘<samp>{,<var>m</var>}</samp>’</dt>
-<dd><a name="index-_007b_002cm_007d"></a>
-<a name="index-braces_002c-first-argument-omitted"></a>
-<a name="index-match-expression-at-most-m-times"></a>
+<dt
id='index-_007b_002cm_007d'><span>‘<samp>{,<var>m</var>}</samp>’<a
href='#index-_007b_002cm_007d' class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-braces_002c-first-argument-omitted"></span>
+<span id="index-match-expression-at-most-m-times"></span>
<p>The preceding item is matched at most <var>m</var> times.
This is a GNU extension.
</p>
</dd>
-<dt>‘<samp>{<var>n</var>,<var>m</var>}</samp>’</dt>
-<dd><a name="index-_007bn_002cm_007d"></a>
-<a name="index-braces_002c-two-arguments"></a>
-<a name="index-match-expression-from-n-to-m-times"></a>
+<dt
id='index-_007bn_002cm_007d'><span>‘<samp>{<var>n</var>,<var>m</var>}</samp>’<a
href='#index-_007bn_002cm_007d' class='copiable-anchor'> ¶</a></span></dt>
+<dd><span id="index-braces_002c-two-arguments"></span>
+<span id="index-match-expression-from-n-to-m-times"></span>
<p>The preceding item is matched at least <var>n</var> times, but not more than
<var>m</var> times.
</p>
@@ -155,10 +142,11 @@
to override these precedence rules and form a subexpression.
An unmatched ‘<samp>)</samp>’ matches just itself.
</p>
+</div>
<hr>
<div class="header">
<p>
-Next: <a
href="Character-Classes-and-Bracket-Expressions.html#Character-Classes-and-Bracket-Expressions"
accesskey="n" rel="next">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>
+Next: <a href="Character-Classes-and-Bracket-Expressions.html">Character
Classes and Bracket Expressions</a>, Up: <a
href="Regular-Expressions.html">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>
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