[EMAIL PROTECTED] writes: >Hi,
>Hi, >I am taking a string as an input from the user and it should only >contain the chars:L , M or R >I tried the folllowing in kodos but they are still not perfect: >[^A-K,^N-Q,^S-Z,^0-9] >[L][M][R] >[LRM]?L?[LRM]? etc but they do not exactly meet what I need. >For eg: LRLRLRLRLM is ok but LRLRLRNL is not as it has 'N' .like that. >regards, >SZ >The string may or may not have all the three chars. >>> var = 'LRLRLRNL' >>> residue = var.replace('L','').replace('R','').replace('M','') >>> if residue != '': ... print 'Invalid characters in input',residue ... Invalid characters in input N -- http://mail.python.org/mailman/listinfo/python-list