https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=19069

--- Comment #8 from Marcel de Rooy <[email protected]> ---
(In reply to Jon Knight from comment #3)
> Is there a reason for having "does not match" and "does not exist"
> considering there is the choice of "if" or "unless"?  In other words isn't:
> 
> "Delete field 999 unless 999$l matches NASH"
> 
> equivalent to
> 
> "Delete field 999 if 999$l does not match NASH"
> 
> ?

Your question and your example do not match.
You are not comparing match and exist here.
Testing for 245a does [not] exist is different from 245a does [not] match
'test'.

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