Regex Help

[sabret00the]

Hey folks, i've written a function, which uses itself in order to generate a list, however if the list already has a child, it needs to recognise this, then make the nessessary adjustments to the string. so if you do indeed follow me, what i'm after is the regex to find a line ending with "</ul>".

ps, i thought about using substr on the fly, but i thought that might be quite intensive???