I am trying to write a regex for a valid java identifier name: I have tried this:
([a-zA-Z_$][a-zA-Z\d_$]*)
but it is accepting spaces also. However, I didn't allowed space to be considered as a match.
Any idea?
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You seem to use it to validate an entire string, so your issue is missing anchors. – Wiktor Stribiżew Jul 12 '17 at 19:31
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Although most Java identifiers use Ascii, all UTF-8 characters are allowed, so it's better to use \p{L} instead of a-zA-Z. – hd42 Jul 09 '21 at 06:52
1 Answers
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You need to include the start and end markers to enforce that the entire string matches the regex. Otherwise, it passes if any part of the string matches.
^([a-zA-Z_$][a-zA-Z\d_$]*)$
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