Alright, so I've figured it out... and in case someone would need it, here's how I did it.
A screenshot from this
example in the manual
has helped.
It's basically copying the code for each row and changing subquestions' codes.
So in my case, for the Question validation equation:
Code:
(is_empty(Expertise_SQ001comment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_SQ001comment.NAOK)) and (is_empty(Expertise_SQ002comment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_SQ002comment.NAOK)) and (is_empty(Expertise_SQ003comment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_SQ003comment.NAOK)) and (is_empty(Expertise_othercomment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_othercomment.NAOK))
and for the Question validation tip:
Code:
{if(is_empty(Expertise_SQ001comment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_SQ001comment.NAOK), '' , 'Only numbers are allowed')}
{if(is_empty(Expertise_SQ002comment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_SQ002comment.NAOK), '' , 'Only numbers are allowed')}
{if(is_empty(Expertise_SQ003comment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_SQ003comment.NAOK), '' , 'Only numbers are allowed')}
{if(is_empty(Expertise_othercomment.NAOK) or regexMatch('/^[1-9][0-9]{0,4}$/', Expertise_othercomment.NAOK), '' , 'Only numbers are allowed')}
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