How to Check if a link string contains a word? (PHP)

[zmitja]

i'm wondering how to check if a string like : http://www.reddit.com/xxx/x/xxx contains the word : reddit.comthat string could contains or not contains reddit.comand if it contains , it execute my function : itsReddit()maybe with preg match? or something like this?Please i don't want a link for tutorial, i only need a php code for this, & THANKS soo much!