We have an C# ASP.Net page where a customer enters in an address where a post office is disallowed as we use UPS for shipping these items. Customers are creative people and they come up with creative means of marking a P.O. Box.
We have this RegEx pattern and it mostly does what we need.
(?i)\b[p]*(?:ost)*\.*\s*[o0]*(?:ffice)*\.*\s+?([b]*[o0]*[x])
This pattern works in almost every case we have on file:
P.O. box 17432
poSt oFFice box 11111
box 222
p0 box 222
#343 po box
#po box 343
It doesn't match (which is the correct behavior):
1234 Main St (Shouldn't match, but we have it in there for a negative test case.)
However, it also doesn't match these and it should:
p0b 222
POB 1112
These samples are actually values that users have, in their generous nature, provided us with. ;)
I'm always up for simplification.
I think this should be close to what you are looking for:
(?i)\b(?:p(?:ost)?\.?\s*[o0](?:ffice)?\.?\s*b(?:[o0]x)?|b[o0]x)
The explanation:
(?: # start non-capturing group
p # match a 'p'
(?:ost)? # optionally match 'ost'
\.? # optionally match a '.'
\s* # match some number of spaces
[o0] # match an 'o' or '0'
(?:ffice)? # optionally match 'ffice'
\.? # optionally match a '.'
\s* # match some number of spaces
b(?:[o0]x)? # match 'b', 'box', or 'b0x'
| # or
b[o0]x # match 'box' or 'b0x'
)
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