When start up my game, everything pops up. The text, the ways I can go and items and such, but when I try to go somewhere like north or east or anywhere, it says...

error running script: Error compiling expression 'IsRegexMatch(cmd.pattern, command, cmd.name)': FunctionCallElement: Could find not function 'IsRegexMatch(Element, String, String)'

I don't know what to do

I believe I already answered this question the first time the OP posted it; but in case anyone else finds it:

This error means you have a command without a pattern. Check all your commands (including verbs) and make sure they have a pattern.