chromatic wrote that the OP's regex matches:

> the literal string "frame="
> followed by a character class containing alphanumerics and the under
+score
> repeated zero or more times
> ...
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I don't think this is right, particularly the bit about the character class. Within a character class definition ("[]"), an asterick matches an asterick--it doesn't have a meta-meaning within a character class. So what that character class actually matches is alphanumerics, the underscore, and an asterick. And it matches it *one time*-- not zero, not more than 1.

That's why just the "c" from "content" got included-- because the character class swipes up one character.

As an example, take a look at this:

my $print_link = "http://www.foo.com/bar?method=go&frame=*content&name
+=baz";
$print_link =~ s/frame=[\w*]&*//;

print $print_link, "\n";
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This prints out

http://www.foo.com/bar?method=go&content&name=baz
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So the regex matched "frame=*".