Agreed, just let me add that you have to use locale; if you want these character classes to be locale-aware. This is like setlocale(LC_ALL, ""); in C, but it's only effective in the lexical scope of the declaration.

Update: the POSIX module has an isdigit function, but you have to apply it to a string, not a character code.

In reply to Re^2: character test functions by ambrus
in thread character test functions by beginer_in_perl

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