It would be easy with a regex:

my $str = "param1(info, blah) param2(new info, more blah)";
while ($str =~ /(\S+\(.*?\))/g) {
    my $pattern = $1;
    print "Found pattern '$pattern'\n";
}
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except that when you're adding to the equation the ability to detect nested parenthetical groupings (ie. parentheses within parentheses):

Parameter2(new info(DN), blah)
[download]

then it makes things a lot more complex.

So you may have to rethink whether that's part of the requirement or not, and if so, how you want to parse it.