RESOLVED -- Okay, maybe I should have checked my input file a little more carefully... turns out I was pointed at the wrong one and it didn't have any instances of the word I was regexp for... I can't figure out how to regexp for a word with underscore in the middle. I'm looking for do_add and do_delete in a file but using /do_add/, /do.add/, and /do\wadd/ give me nothing. I know I'm missing something obvious but I can't figure it out. 
while (<filehandle>) {
   if (/do_add/) {
      [some stuff here]
   }
}

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In reply to Regexp for word with underscore in the middle by klaun

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