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Changes to grep/manual/html_node/Basic-vs-Extended.html,v
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From: |
Jim Meyering |
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Subject: |
Changes to grep/manual/html_node/Basic-vs-Extended.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/Basic-vs-Extended.html
===================================================================
RCS file: /webcvs/grep/grep/manual/html_node/Basic-vs-Extended.html,v
retrieving revision 1.21
retrieving revision 1.22
diff -u -b -r1.21 -r1.22
--- html_node/Basic-vs-Extended.html 2 Nov 2015 02:54:31 -0000 1.21
+++ html_node/Basic-vs-Extended.html 5 Feb 2016 00:44:50 -0000 1.22
@@ -1,70 +1,99 @@
-<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>Basic vs Extended - GNU Grep 2.22</title>
+<title>GNU Grep 2.23: Basic vs Extended</title>
+
+<meta name="description" content="GNU Grep 2.23: Basic vs Extended">
+<meta name="keywords" content="GNU Grep 2.23: Basic vs Extended">
+<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="Back_002dreferences-and-Subexpressions.html#Back_002dreferences-and-Subexpressions"
title="Back-references and Subexpressions">
-<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="Usage.html#Usage" rel="next" title="Usage">
+<link
href="Back_002dreferences-and-Subexpressions.html#Back_002dreferences-and-Subexpressions"
rel="prev" title="Back-references and Subexpressions">
+<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="Basic-vs-Extended"></a>
+<div class="header">
<p>
-Previous: <a rel="previous" accesskey="p"
href="Back_002dreferences-and-Subexpressions.html#Back_002dreferences-and-Subexpressions">Back-references
and Subexpressions</a>,
-Up: <a rel="up" accesskey="u"
href="Regular-Expressions.html#Regular-Expressions">Regular Expressions</a>
-<hr>
+Previous: <a
href="Back_002dreferences-and-Subexpressions.html#Back_002dreferences-and-Subexpressions"
accesskey="p" rel="prev">Back-references and Subexpressions</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="Basic-vs-Extended-Regular-Expressions"></a>
<h3 class="section">3.6 Basic vs Extended Regular Expressions</h3>
+<a name="index-basic-regular-expressions"></a>
-<p><a name="index-basic-regular-expressions-253"></a>
-In basic regular expressions the meta-characters ‘<samp><span
class="samp">?</span></samp>’, ‘<samp><span
class="samp">+</span></samp>’,
-‘<samp><span class="samp">{</span></samp>’, ‘<samp><span
class="samp">|</span></samp>’, ‘<samp><span
class="samp">(</span></samp>’, and ‘<samp><span
class="samp">)</span></samp>’ lose their special meaning;
-instead use the backslashed versions ‘<samp><span
class="samp">\?</span></samp>’, ‘<samp><span
class="samp">\+</span></samp>’, ‘<samp><span
class="samp">\{</span></samp>’,
-‘<samp><span class="samp">\|</span></samp>’, ‘<samp><span
class="samp">\(</span></samp>’, and ‘<samp><span
class="samp">\)</span></samp>’.
-
- <p><a name="index-interval-specifications-254"></a>Traditional <samp><span
class="command">egrep</span></samp> did not support the ‘<samp><span
class="samp">{</span></samp>’ meta-character,
-and some <samp><span class="command">egrep</span></samp> implementations
support ‘<samp><span class="samp">\{</span></samp>’ instead, so
-portable scripts should avoid ‘<samp><span
class="samp">{</span></samp>’ in ‘<samp><span class="samp">grep
-E</span></samp>’ patterns and
-should use ‘<samp><span class="samp">[{]</span></samp>’ to match a
literal ‘<samp><span class="samp">{</span></samp>’.
-
- <p>GNU <samp><span class="command">grep -E</span></samp> attempts to
support traditional usage by
-assuming that ‘<samp><span class="samp">{</span></samp>’ is not
special if it would be the start of an
+<p>In basic regular expressions the meta-characters
‘<samp>?</samp>’, ‘<samp>+</samp>’,
+‘<samp>{</samp>’, ‘<samp>|</samp>’,
‘<samp>(</samp>’, and ‘<samp>)</samp>’ lose their
special meaning;
+instead use the backslashed versions ‘<samp>\?</samp>’,
‘<samp>\+</samp>’, ‘<samp>\{</samp>’,
+‘<samp>\|</samp>’, ‘<samp>\(</samp>’, and
‘<samp>\)</samp>’.
+</p>
+<a name="index-interval-specifications"></a>
+<p>Traditional <code>egrep</code> did not support the
‘<samp>{</samp>’ meta-character,
+and some <code>egrep</code> implementations support
‘<samp>\{</samp>’ instead, so
+portable scripts should avoid ‘<samp>{</samp>’ in
‘<samp>grep -E</samp>’ patterns and
+should use ‘<samp>[{]</samp>’ to match a literal
‘<samp>{</samp>’.
+</p>
+<p>GNU <code>grep -E</code> attempts to support traditional usage by
+assuming that ‘<samp>{</samp>’ is not special if it would be the
start of an
invalid interval specification.
For example, the command
-‘<samp><span class="samp">grep -E '{1'</span></samp>’ searches for
the two-character string ‘<samp><span class="samp">{1</span></samp>’
+‘<samp>grep -E '{1'</samp>’ searches for the
two-character string ‘<samp>{1</samp>’
instead of reporting a syntax error in the regular expression.
POSIX allows this behavior as an extension, but portable scripts
should avoid it.
+</p>
+
+
- </body></html>
+</body>
+</html>
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