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  1. or download this
    perl -Mre=debug -e '$_ = q!(b).!; /\((?=a|b|c)\)/ && do { print qq{mat
+ch! $&\n}; };'
perl -Mre=debug -e '$_ = q!(b).!; /\((?=a|b|c)/ && do { print qq{match
+! $&\n}; };'
  2. or download this
    $ perl -Mre=debug -e '$_ = q!(b).!; /\((?=a|b|c)\)/ && do { print qq{m
+atch! $&\n}; };'
Compiling REx "\((?=a|b|c)\)"
...
match! (
Freeing REx: "\((?=a|b|c)"