Re: self limiting regex help

[danger]

in reply to self limiting regex help

If I understand your conditions correctly, this should do:

    print if /^  [ACGT]*    ([RYMKSWHBVDN])?
              (?:[ACGT]|\1)*([RYMKSWHBVDN])?
              (?:[ACGT]|\1|\2)*$
             /ix;

[spq]

Eureka! I was just attempting to do something similar, but had discovered that \n doesn't work in a character class.

Thank you (and everyone who responded) very much for your help!