Remove from certian point

[I Am Legend]

Hey i was wondering how i could remove everything after a certian point?

Say i have,

QM_Expert: Hello forum.

How could i remove everything before the ":" sign? So i was left with just "Hello Forum."

Thanks.

why would u need to remove things befor it if its a new topic???? looks like a party p question to me ..oh i see your trying to spam tables? and u need to remove the text that says to typ there oh ok i guess thats not cheating