Escape html source for a string to split it

Hello!
I try to read the source code of a html document and search for a string.
The source code, what i read out with _IEDocReadHTML($oIE) are for examble:

?({'url':'http://api.game.com/login.php?userid=USERID&username=USERNAME&time=1367968978&server=s5&flag=76f8c752cacde3cfb5defc6900c19af4'})

I need to escape the string in saprate local variables.
userid=
username=
time=
server=
flag=

I try it with StringRegExp but i have in my string spetial caracters like the Quationmark or dots and gat a compile error.

How can i do that? I'm new in Autoit and don't know next.

Thanks