I've expanded the solution so it's a bit easier to read:
$string =~ s{
(?<![-\w./])
(
\s?
[-\w.]*
$item
[-\w.]*
\s?
)
}{<b>$1<\/b>}gimsx;
Test output:
$ regex_slash_prob.pl
<a href="/cgi-programming-with-perl.zip"><b>cgi-programming-with-perl.
+zip</b></a>
Update:
While the solution above answers your question, consider the following.
If the HTML actually looks more like this:
my $string = qq|
<a href="/cgi-programming-with-perl.zip">
cgi-programming-with-perl.zip
</a>
|;
Your output will look like:
<a href="/cgi-programming-with-perl.zip">
<b> cgi-programming-with-perl.zip
</b> </a>
If you'd prefer it to look like:
<a href="/cgi-programming-with-perl.zip">
<b>cgi-programming-with-perl.zip</b>
</a>
Remove both \s? lines, leaving:
$string =~ s{
(?<![-\w./])
(
[-\w.]*
$item
[-\w.]*
)
}{<b>$1<\/b>}gimsx;
You had them in your original so I left them in thinking they perhaps served some other purpose in the real data you're working on (as the string you posted contained no whitespace at all).
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