preg searches for matches of a regular expression to a protein sequence.

Here is a sample session with preg:

% preg
regular expression search of a protein sequence
Input sequence(s): sw:*_rat
Output file [100k_rat.preg]: stdout
Regular expression pattern: IA[QWF]A

Mandatory qualifiers:

[-sequence] (seqall)

Sequence database USA.

[-pattern] (regexp)

Regular expression pattern.

[-outfile] (outfile)

Output filename.