WeiDU question: PATCH_IF

Throwing this out to see if anyone on these boards knows the answer:

Given this code:

COPY_EXISTING_REGEXP GLOB ~^.+\.itm$~ ~override~
	READ_STRREF 0x0c "name"
	PATCH_IF ~%name%~ contains ~+1~ BEGIN
		INNER_PATCH_SAVE new_name ~%name%~ BEGIN
			REPLACE_TEXTUALLY ~ +1~ ~~
		END
		SAY_EVALUATED 0x0c ~%new_name%~
	END

I'm reasonably sure all of that works, except for the "contains" bit, which I just put there as a marker of what I want to do.

Anyone know how I can do that - only patch if the string contains some particular text?