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Changes to doc/grep_7.html
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From: |
Karl Berry |
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Subject: |
Changes to doc/grep_7.html |
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Date: |
Sun, 24 May 2009 18:43:17 +0000 |
CVSROOT: /web/grep
Module name: grep
Changes by: Karl Berry <karl> 09/05/24 18:43:01
Index: doc/grep_7.html
===================================================================
RCS file: doc/grep_7.html
diff -N doc/grep_7.html
--- doc/grep_7.html 23 Jan 2002 10:33:52 -0000 1.3
+++ /dev/null 1 Jan 1970 00:00:00 -0000
@@ -1,151 +0,0 @@
-<HTML>
-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<!-- Created on January, 23 2002 by texi2html 1.64 -->
-<!--
-Written by: Lionel Cons <address@hidden> (original author)
- Karl Berry <address@hidden>
- Olaf Bachmann <address@hidden>
- and many others.
-Maintained by: Olaf Bachmann <address@hidden>
-Send bugs and suggestions to <address@hidden>
-
--->
-<HEAD>
-<TITLE>grep, print lines matching a pattern: Regular Expressions</TITLE>
-
-<META NAME="description" CONTENT="grep, print lines matching a pattern:
Regular Expressions">
-<META NAME="keywords" CONTENT="grep, print lines matching a pattern: Regular
Expressions">
-<META NAME="resource-type" CONTENT="document">
-<META NAME="distribution" CONTENT="global">
-<META NAME="Generator" CONTENT="texi2html 1.64">
-
-</HEAD>
-
-<BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080"
ALINK="#FF0000">
-
-<A NAME="SEC7"></A>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_6.html#SEC6"> <
</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_8.html#SEC8"> > </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A
HREF="grep_13.html#SEC13"> << </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep.html#SEC_Top"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_13.html#SEC13"> >>
</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE"
ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A
HREF="grep.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A
HREF="grep_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_21.html#SEC21">Index</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_abt.html#SEC_About"> ?
</A>]</TD>
-</TR></TABLE>
-<HR SIZE=1>
-<H1> 5. Regular Expressions </H1>
-<!--docid::SEC7::-->
-<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.
-<CODE>grep</CODE> understands two different versions of regular expression
-syntax: "basic"(BRE) and "extended"(ERE). In GNU <CODE>grep</CODE>,
-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.
-</P><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 metacharacter
-with special meaning may be quoted by preceding it with a backslash.
-</P><P>
-
-A regular expression may be followed by one of several
-repetition operators:
-</P><P>
-
-<DL COMPACT>
-
-<DT><SAMP>`.'</SAMP>
-<DD><A NAME="IDX157"></A>
-<A NAME="IDX158"></A>
-<A NAME="IDX159"></A>
-The period <SAMP>`.'</SAMP> matches any single character.
-<P>
-
-<DT><SAMP>`?'</SAMP>
-<DD><A NAME="IDX160"></A>
-<A NAME="IDX161"></A>
-<A NAME="IDX162"></A>
-The preceding item is optional and will be matched at most once.
-<P>
-
-<DT><SAMP>`*'</SAMP>
-<DD><A NAME="IDX163"></A>
-<A NAME="IDX164"></A>
-<A NAME="IDX165"></A>
-The preceding item will be matched zero or more times.
-<P>
-
-<DT><SAMP>`+'</SAMP>
-<DD><A NAME="IDX166"></A>
-<A NAME="IDX167"></A>
-The preceding item will be matched one or more times.
-<P>
-
-<DT><SAMP>`{<VAR>n</VAR>}'</SAMP>
-<DD><A NAME="IDX168"></A>
-<A NAME="IDX169"></A>
-<A NAME="IDX170"></A>
-The preceding item is matched exactly <VAR>n</VAR> times.
-<P>
-
-<DT><SAMP>`{<VAR>n</VAR>,}'</SAMP>
-<DD><A NAME="IDX171"></A>
-<A NAME="IDX172"></A>
-<A NAME="IDX173"></A>
-The preceding item is matched n or more times.
-<P>
-
-<DT><SAMP>`{<VAR>n</VAR>,<VAR>m</VAR>}'</SAMP>
-<DD><A NAME="IDX174"></A>
-<A NAME="IDX175"></A>
-The preceding item is matched at least <VAR>n</VAR> times, but not more than
-<VAR>m</VAR> times.
-<P>
-
-</DL>
-<P>
-
-Two regular expressions may be concatenated; the resulting regular
-expression matches any string formed by concatenating two substrings
-that respectively match the concatenated subexpressions.
-</P><P>
-
-Two regular expressions may be joined by the infix operator <SAMP>`|'</SAMP>;
the
-resulting regular expression matches any string matching either subexpression.
-</P><P>
-
-Repetition takes precedence over concatenation, which in turn
-takes precedence over alternation. A whole subexpression may be
-enclosed in parentheses to override these precedence rules.
-</P><P>
-
-<HR SIZE=1>
-<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
-<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_6.html#SEC6"> <
</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_8.html#SEC8"> > </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A
HREF="grep_13.html#SEC13"> << </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep.html#SEC_Top"> Up </A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_13.html#SEC13"> >>
</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">
<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE"
ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A
HREF="grep.html#SEC_Top">Top</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A
HREF="grep_toc.html#SEC_Contents">Contents</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_21.html#SEC21">Index</A>]</TD>
-<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="grep_abt.html#SEC_About"> ?
</A>]</TD>
-</TR></TABLE>
-<BR>
-<FONT SIZE="-1">
-This document was generated
-by <I>root</I> on <I>January, 23 2002</I>
-using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
-"><I>texi2html</I></A>
-
-</BODY>
-</HTML>
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