[SOLVED] Regex: xor of two wilcards?

Issue

I've been trying to make a regex match that will match against CPU instructions like:

and val1, val2
sub val1, val2

How can I make a regex that can perform a wildcard in place of both of these values BUT, the two values cannot be the same?

and ...\, ...
sub ...\, ...

But where the first ... != the second ...

Solution

Using any awk in any shell on every UNIX box:

awk -F'[ ,]+' '($1 ~ /^(and|sub)$/) && ($2 != $3)' file

Answered By - Ed Morton