PHP preg_match for ending tag

Question

I need to use preg_match to check if a line is ending with /> or / >
I have created a function, that contains the followling line

if (!preg_match('\/>$', $str)) {

But it do not work, as it comes with this error

Warning: preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash

How can I make it work?

Answer 1

Added an optional space between \ and >.

if (!preg_match('|\/ ?>$|', $str)) {

Answer 2

http://php.net/manual/en/regexp.reference.delimiters.php

When using the PCRE functions, it is required that the pattern is enclosed by delimiters. A delimiter can be any non-alphanumeric, non-backslash, non-whitespace character.

You can use | for example

if (!preg_match('|\/>$|', $str)) {