Regex not working

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Hi, the Regex below is not working for the ‘an’ although it should according to https://www.freeformatter.com/java-regex-tester.html#ad-output Any proposals, why this is the case?   Thx!   if $currentObject/Title = 'Top Management' then empty else if isMatch($currentObject/Title,'^[A|a|E|e|I|i|O|o|U|u]') then 'an' else 'a'  
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1 answers
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The regex should match the entire input. The current regex only matches the first character, that is why the substring will work. Furthermore, the pinelines (|) are unnecessary.

The resulting regex would be:

[AaEeIiOoUu].*

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