something strange is happening, $replace not working

[madscijr]

Oh, yes, StrReplace$ is part of the QB64 source (source\utilities\strings.bas). But you must of course $INCLUDE that file in your program to use it.

Thanks for your reply. 
So it ISN'T a built in function. 
I've been using it for so long, I can't remember - my coffee has not kicked in yet, and for some reason searching for the function didn't yield any results so I figured it must be a built in command. When back at my PC later I'll check to see if my notepad++ search settings were maybe stuck on "case sensitive" or something. I definitely got the function from "strings.bas". 
Thanks again for the sanity check.