Converting PHP Regex's to Javascript (or what are the differences?)

Question

I have a form generator that uses (perl compatible) regexes for ther backend validation. Since the whole form is being dynamically generated it was fairly trivial to add a

Answer 1

Read about specific implementation details for Regular Expressions in Javascript.

JavaScript implements Perl-style regular expressions. However, it lacks quite a number of advanced features available in Perl and other modern regular expression flavors

For one thing, the / character denotes the beginning and end of a regex in Javascript, so you might need to escape it, but that depends on how you're instantiating the regular expression in Javascript (with the literal notation or the RegExp class).