http://qs321.pair.com?node_id=411539

seaver has asked for the wisdom of the Perl Monks concerning the following question:

Dear all,

I have this very simple pattern:

/[QGYN]{3,6}/

which i run on some 100 yeast protein sequences. The pattern does it's job.

My problem is that I want to make sure I don't get any repeats of more than 2 letters in that sequence. Meaning I don't mind seeing 'NN', but I do mind seeing 'NNN'.

What's the best way of doing this?

Thanks
Sam