Re: how to use regular expressions read some string from a htm file

You don't. You use HTML::TreeBuilder or some such similar module. Life is too short to bother reinventing that particular wheel. Markup is hard to write regexen to parse because there are many special cases for handling things like white space. Try something like:

use strict;
use warnings;
use HTML::TreeBuilder;

my $str = <<'STR';
<html><head><title>my page></title></head>
<body>
<table><tr><td>
<a href="http://mysite/bbsui.jsp?id=dxpwd">dxpwd</a>
</td><td>
<a href="http://mysite/bbsui.jsp?id=jimeth">jimeth</a>
</td><td>
<a href="http://mysite/bbsui.jsp?id=jone28">jone28</a>
</td><td>
<a href="http://mysite/bbsui.jsp?id=25528">25528</a>
</td></tr>
</body></html>
STR

my $tree = HTML::TreeBuilder->new;

$tree->parse ($str);

print $_->attr ('href') . "\n" for $tree->find ('a');
[download]

Prints:

http://mysite/bbsui.jsp?id=dxpwd
http://mysite/bbsui.jsp?id=jimeth
http://mysite/bbsui.jsp?id=jone28
http://mysite/bbsui.jsp?id=25528
[download]

DWIM is Perl's answer to Gödel

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