Regular Expression avoiding characters up to code 255

Question

Dear Masters! Is it possible to ensure, that only characters with codes between 0 and 255 will be accepted by regular expression, but all with the codes up to 256 not? Thank you!

Answer 1

Yes, you can represent hex ranges in regex:

boolean matches = string.matches("[\\x00-\\xFF]+");

This will match everything which contains at least one character in the 0x00-0xFF range.

Answer 2

You can match [\x00-\xFF], i.e. the range of characters between 0 and 255.