Regex Optional Groups?

Question

I seem to have confused myself with a preg_match regex I\'m doing, so fresh eyes and help would be appreciated.

My current regex is as follows:

/<         


        

Answer 1

This uses an optional non-capturing group -- (?: )? -- to match your optional part, and also \d instead of [0-9] to match digits:

/(.*?)/se

If numbers in parentheses can consist of more than one digit, use this one instead:

/(.*?)/se