Good answers above; suggestion below as a variant way of saying "Welcome to the Monastery."

Please read:

• On asking for help which may help understand why Monks asked that you outline your expectations (specfically, what you wanted) and what you actually got (as it's not absolutely clear whether you want to capture the enclosing parens or not).
• Then check Markup in the Monastery and Writeup Formatting Tips for formatting guidance (hint: pre is strongly discouraged.)

Re your code: Note that the [ ... ] does NOT "escape" the character(s) it encloses in the usual sense (though it will cause the paren to be treated as a literal, in a regex). But so too will the customary escape character, the backslash (\).

If you plan to do much with Perl regexen, Mastering Regular Expressions (ca $US45.) and/or O'Reilly's "Regular Expressions Pocket Reference" ( <$US10.) are well worth the investment.