Regex for detecting variations on PO Box

gistfile1.js

var pobReg = /\bbox(?:\b$|([\s|\-]+)?[0-9]+)|(p[\-\.\s]?o.?[\-\s]?|post office\s)b(\.|ox)?/igm;

/* 
Matches:

po box
p.o.b.
pob
p.o. box
po-box
p.o.-box
PO-Box
p.o box
pobox
p-o-box
p-o box
post office box
P.O. Box
PO Box
PO box
box 122
Box122
Box-122


Does not match:

123 Boxing Street
34 Box Handler Road
424 PO Dance drive
234 P.O.D. Wasn't terrible Circle
*/