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The regex for Sanliurfa on that quiz (and the Asia version) is ^(S?AN?L)?R?[AEIOU]+[HR]F?A. Given the complexity of the regex, the acceptance of 'ara' is indeed, probably a mistake.

Interestingly, other quizzes like the Provinces of Turkey quiz use the standard JetPunk type-in (the green tick). These ones have the regex ^SANL[AEIOU]+RFA (which does NOT accept 'ara'). It also accepts 'urfa' and 'alruha'