How do I use IS_MATCH for field validation if the field only contains data?
This works for me:
IS_MATCH('^\d{10}', extract=True, error_message='Telephone number should
have 10 digits.')
so long as a 10 digit number is required.
But what if I a want to make it acceptable to enter a 10 digit number or
leave the field blank?
Is there a way to make the IS_MATCH validator checked only if a non-empty
string has been passed to the FORM for that field?
Apologies if this is a very obvious question - but I've tried several
approaches and haven't come up with a satisfactory solution.
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