If the things in @params are just words (i.e., no regular expression special characters), you probably want to make a single regular expression out of them ahead of time and rewrite the inner loop like so:
[ . . . snip . . . ]
Of course, even if they contain regular expression special characters you might want to do this, but be really careful about it. :-)

You should be careful even if they don't contain metacharacters.

In this case, the whitespace helps to anchor the expression, but you shouldn't rely on that. For instance, what if you have both "foo" and "foo\t" in your array? (Which gets matched may depend on the order they appear in the expression.) Be especially wary of changing the rest of the regular expression or trying to re-use $paramre in another one.

Also, you would need to add a /g modifier and loop over the matches to get the same behavior as the original.

-sauoq
"My two cents aren't worth a dime.";