in reply to Why does this simple grouping regex not match?
I'm not sure how it iterprets exactly, but I think you need actually(?=a|b|c)
orperl -e '$_ = "(b)."; /\([abc]\)/ && do { print "match!\n"; };'
perl -e '$_ = "(b)."; /\((a|b|c)\)/ && do { print "match!\n"; };'
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