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Is there a possibility to write a regex that matches for [a-zA-Z]{2,4} but not for the word test? Or do i need to filter this in several steps?
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To match any character except a list of excluded characters, put the excluded charaters between [^ and ] . The caret ^ must immediately follow the [ or else it stands for just itself.
The \b metacharacter matches at the beginning or end of a word.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" .
\B matches at every position where \b does not. Effectively, \B matches at any position between two word characters as well as at any position between two non-word characters.
Sure, you can use a negative lookahead.
(?!test)[a-zA-Z]{2,4}
I don't know if you'll need it for what you're doing, but note that you may need to use start and end anchors (^ and $) if you're checking that an entire input matches that pattern. Otherwise, it could match something like ouaeghAEtest because it will still find four chars somewhere that aren't "test".
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