trying to match a string

arnimavidyarthy at arnimavidyarthy at
Fri Jul 18 12:33:55 CEST 2008



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:

[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.


The string may or may not have all the three chars.

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