Could someone please tell me how I can take a string of letters that is input and edit it to make sure there are now letters that are not appropriate.

Say someone enters: "TAZGCAACCCGGB"

I want to eliminate any letters other than A, C, G, or T. Then I want to print the sequence out in triplets with spaces in between in three letters: "TAG CAA CCC GG"

Thanking you in advance,

Little Shell

are you into web or windows development.

you can use the validation controls to specify a regular expression for validation of your strings.

Regards
Ganesh

Ganesh,

I am writing code in a windows form. If I look in help under validation code, I'll find some help?

Little Shell