I´ve found a long List of variations of vowels, for example: Û, â, ê, é etc.
Is there a comfortable way to check all vowels and catch the ones, which are not "normal" - vowels ?
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_Normal_ is in the eye of the beholder. I guess you could check if it's in the ASCII range? – 500 - Internal Server Error May 06 '20 at 14:22
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It gets more complicate than that as well, you can have combining characters so that you have the "normal" character in one codepoint and the accent in another, such as `"U\u0302"` which will produce the same as `"Û"`. My guess is that this question and answer will provide what you seek - https://stackoverflow.com/questions/249087/how-do-i-remove-diacritics-accents-from-a-string-in-net - even though it is not a proper duplicate. – Lasse V. Karlsen May 06 '20 at 14:23
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One approach would be to normalize each character to form D, and if it decomposes into something containing a diacritic (NonSpacingMark in the .NET categories), it would be one of those you call "not normal". – Lasse V. Karlsen May 06 '20 at 14:24
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Do you need to differentiate between accent, circumflex, etc? If you just need to detect diacritics see this question: [How to check if Unicode character has diacritics in .Net?](https://stackoverflow.com/questions/9349608/how-to-check-if-unicode-character-has-diacritics-in-net) – default locale May 06 '20 at 17:50