I have the following regex in Java: private static final String ALPHA_REGEX = [^A-Za-z]+$;

Question

Asked: June 7, 20262026-06-07T13:01:33+00:00 2026-06-07T13:01:33+00:00

I have the following regex in Java:

private static final String ALPHA_REGEX = "[^A-Za-z]+$";

If I input say “a334234234” the validation will fail. However if I input “a3423423fsfsdf” the validation succeeds…

Same goes for the following regex which checks whether the input is numeric only:

private final static    Pattern NUMBER_ONLY_PATTERN = Pattern.compile("[^0-9 ]+$", Pattern.CASE_INSENSITIVE);

If I input 4saasd the validation fails, but if I input 3dfsdf22 the validation is successful. Can you help me with this?

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Editorial Team · Answer 1 · 2026-06-07T13:01:35+00:00

Editorial Team

^ in [] mean not, but without [] it means beginning of string, this is your issue

^[a-zA-Z]+$ – only letter

^\d+$ – only digit

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