ch06_22.htm
来自「By Tom Christiansen and Nathan Torkingto」· HTM 代码 · 共 292 行
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<HTML><HEAD><TITLE>Recipe 6.21. Program: urlify (Perl Cookbook)</TITLE><METANAME="DC.title"CONTENT="Perl Cookbook"><METANAME="DC.creator"CONTENT="Tom Christiansen & Nathan Torkington"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1999-07-02T01:35:08Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-243-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch06_01.htm"TITLE="6. Pattern Matching"><LINKREL="prev"HREF="ch06_21.htm"TITLE="6.20. Matching Abbreviations"><LINKREL="next"HREF="ch06_23.htm"TITLE="6.22. Program: tcgrep"></HEAD><BODYBGCOLOR="#FFFFFF"><img alt="Book Home" border="0" src="gifs/smbanner.gif" usemap="#banner-map" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Perl Cookbook"><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><p><TABLEWIDTH="684"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch06_21.htm"TITLE="6.20. Matching Abbreviations"><IMGSRC="../gifs/txtpreva.gif"ALT="Previous: 6.20. Matching Abbreviations"BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="228"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1"><ACLASS="chapter"REL="up"HREF="ch06_01.htm"TITLE="6. Pattern Matching"></A></FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch06_23.htm"TITLE="6.22. Program: tcgrep"><IMGSRC="../gifs/txtnexta.gif"ALT="Next: 6.22. Program: tcgrep"BORDER="0"></A></TD></TR></TABLE></DIV><DIVCLASS="sect1"><H2CLASS="sect1"><ACLASS="title"NAME="ch06-chap06_program_0">6.21. Program: urlify</A></H2><PCLASS="para"><ACLASS="indexterm"NAME="ch06-idx-1000007729-0"></A><ACLASS="indexterm"NAME="ch06-idx-1000007729-1"></A><ACLASS="indexterm"NAME="ch06-idx-1000007729-2"></A><ACLASS="indexterm"NAME="ch06-idx-1000007729-3"></A><ACLASS="indexterm"NAME="ch06-idx-1000007729-4"></A>This program puts HTML links around URLs in files. It doesn't work on all possible URLs, but does hit the most common ones. It tries hard to avoid including end-of-sentence punctuation in the marked-up URL.</P><PCLASS="para">It is a typical Perl filter, so it can be used by feeding it input:</P><PRECLASS="programlisting">% gunzip -c ~/mail/archive.gz | urlify > archive.urlified</PRE><PCLASS="para">or by supplying files on the command line:</P><PRECLASS="programlisting">% urlify ~/mail/*.inbox > ~/allmail.urlified</PRE><PCLASS="para">The program is shown in <ACLASS="xref"HREF="ch06_22.htm#ch06-24264"TITLE="urlify">Example 6.13</A>.</P><DIVCLASS="example"><H4CLASS="example"><ACLASS="title"NAME="ch06-24264">Example 6.13: urlify</A></H4><PRECLASS="programlisting">#!/usr/bin/perl# urlify - wrap HTML links around URL-like constructs$urls = '(http|telnet|gopher|file|wais|ftp)';$ltrs = '\w';$gunk = '/#~:.?+=&%@!\-';$punc = '.:?\-';$any = "${ltrs}${gunk}${punc}";while (<>) { s{ \b # start at word boundary ( # begin $1 { $urls : # need resource and a colon [$any] +? # followed by on or more # of any valid character, but # be conservative and take only # what you need to.... ) # end $1 } (?= # look-ahead non-consumptive assertion [$punc]* # either 0 or more punctuation [^$any] # followed by a non-url char | # or else $ # then end of the string ) }{<A HREF="$1">$1</A>}igox; print;}<ACLASS="indexterm"NAME="ch06-idx-1000007731-0"></A><ACLASS="indexterm"NAME="ch06-idx-1000007731-1"></A><ACLASS="indexterm"NAME="ch06-idx-1000007731-2"></A><ACLASS="indexterm"NAME="ch06-idx-1000007731-3"></A><ACLASS="indexterm"NAME="ch06-idx-1000007731-4"></A></PRE></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="684"TITLE="footer"><TABLEWIDTH="684"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch06_21.htm"TITLE="6.20. 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