你不應該首先使用正則表達式這一點。你正試圖用一個正則表達式做太多事情(爲什麼要參考Can you provide some examples of why it is hard to parse XML and HTML with a regex?)。你需要的是一個HTML解析器。有關使用各種解析器的示例,請參閱Can you provide an example of parsing HTML with your favorite parser?。
看看HTML::Parser
。這裏有一個可能不完整的實現:
#!/usr/bin/perl
use strict;
use warnings;
use HTML::Parser;
{
my %map = (
foo => "f",
bar => "b",
);
sub start {
my ($tag, $attr) = @_;
my $attr_string = '';
for my $key (keys %$attr) {
if ($key eq 'class') {
my @classes = split " ", $attr->{$key};
#FIXME: this should be using //, but
#it is only availble starting in 5.10
#so I am using || which will do the
#wrong thing if the class is 0, so
#don't use a class of 0 in %map , m'kay
$attr->{$key} = join " ",
map { $map{$_} || $_ } @classes;
}
$attr_string .= qq/ $key="$attr->{$key}"/;
}
print "<$tag$attr_string>";
}
}
sub text {
print shift;
}
sub end {
my $tag = shift;
print "</$tag>";
}
my $p = HTML::Parser->new(
start_h => [ \&start, "tagname,attr" ],
text_h => [ \&text, "dtext" ],
end_h => [ \&end, "tagname" ],
);
$p->parse_file(\*DATA);
__DATA__
<html>
<head>
<title>foo</title>
</head>
<body>
<span class="foo">Foo!</span> <span class="bar">Bar!</span>
<span class="foo bar">Foo Bar!</span>
This should not be touched: class="foo"
</body>
</html>
有些人可能會說`left`和`tall`就像`a`和`b`一樣被模糊處理。 – 2009-08-01 22:43:45