regex doubts

[Mr SZ]

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.


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