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Changes to manual/html_node/Regular-Expressions.html
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From: |
Karl Berry |
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Subject: |
Changes to manual/html_node/Regular-Expressions.html |
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Date: |
Sun, 24 May 2009 18:43:10 +0000 |
CVSROOT: /web/grep
Module name: grep
Changes by: Karl Berry <karl> 09/05/24 18:43:01
Index: manual/html_node/Regular-Expressions.html
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RCS file: manual/html_node/Regular-Expressions.html
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+<html lang="en">
+<head>
+<title>Regular Expressions - GNU Grep 2.5.4</title>
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+
+<h2 class="chapter">3 Regular Expressions</h2>
+
+<p><a name="index-regular-expressions-178"></a>
+A <dfn>regular expression</dfn> 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
+two different versions of regular expression syntax:
+“basic”(BRE) and “extended”(ERE).
+In <span class="sc">gnu</span> <samp><span class="command">grep</span></samp>,
+there is no difference in available functionality using either syntax.
+In other implementations, basic regular expressions are less powerful.
+The following description applies to extended regular expressions;
+differences for basic regular expressions are summarized afterwards.
+
+<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>
+
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