http://qs321.pair.com?node_id=1211954

skooma has asked for the wisdom of the Perl Monks concerning the following question:

The pattern example is, {aa_bb_cc_dd_... (characters with underscores, one or more )} (or) {a1_11_1c_1... (alphanumeric characters with underscores, one or more)} (or) {aaa... (just characters, one or more)}