So could 
while(<>)  {
        print "yes\n" if /^y$/i || /^yes$/i;
}

[download]
while(<>)  {
        print "yes\n" if /^y$/i;
        print "yes\n" if /^yes$/i;
}

[download]

By the way, useless capturing greatly slows down pattern matching.

In reply to Re^3: conditional regex by ikegami
in thread conditional regex by Anonymous Monk

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