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#!/usr/bin/perl -- use Regex::PreSuf; ... ]); __END__ a(?:bcpwb(?:ln0[78]|nn(?:06|10))|desic(?:ln0[189]|nn05))
#!/usr/bin/perl -- ... print $ra->re; __END__ (?-xism:a(?:bcpwb(?:nn(?:06|10)|ln0[78])|desic(?:ln0[189]|nn05)))