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!is_numeric(strpos(Q2, ' '))
To use subquestion validation, you need something like thisteracomp wrote: Seems that spaces are 99% of my problem, so might be all I need.
Where do I add the equation? I've tried: {str_replace(" ","",userdata_email)} in the question "sub-question validation expression" but that does not appear to fire...at least not in the Preview Question interface.