Hi Daniel,

Yes, it works with "isalnum" in my test, but another define, just below: is_char_equal is also using "isalpha" but I don't know if it needs modification:

#define is_char_equal(_c_,_cs_) \
        ( (isalpha((int)_c_)?(((_c_)|0x20)==(_cs_)):((_c_)==(_cs_)))==1 )

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