Regex pattern for SSN (OCR'd)


I'm working on a small application where I've to read TIF files, OCR them and look for SSNs in the OCR'd text. I use the following regular expression, but the issue is that depending on the quality of the TIF file, the SSNs get OCR'd in few different patterns. I would like to know if there is any single pattern that can help me identify all such patterns in one pass. I greatly appreciate your help.

Pattern that I use - \b\S{3}\-\S{2}\-\S{4}\b

Patterns I found so far
1. 99-99(space)-9999
2. 999-99-9999 (straight forward)
3. x99-99-9999
4. xx9-99-x9999
5. x9x-x9(space)-9999
where x could be any alphabet or special character. If the OCR software cannot identify the exact character, it injects some character in that position.

Thank you for looking into my problem.

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>>If the OCR software cannot identify the exact character, it injects some character in that position.
And what do you want to do in said situation? Keep the non-numeric character or not?
mohan_sekarAuthor Commented:
Thanks Hielo, but it didn't work.
Yes, I want to keep the non-numeric character as is.
For example, iii-99-9999 or i99-99-9999 will not match.
Pawel WitkowskiSenior Javascript DeveloperCommented:
try this one:



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mohan_sekarAuthor Commented:
Thanks, Wilg32. Your expression covers most of my cases, but I have issues with the following ones

1. 999-99x9999 (instead of hyphen I get characters like ~ or i)
2. 999x-99-9999 (I get an extra character before the hyphen here)
mohan_sekarAuthor Commented:
Your expression is too generic. It might match with any 11 or 12 character strings and not just SSNs. Example phone numbers.
but what you are describing is also a "Generic" pattern. You don't always get a hyphen, but you also don't know what you are going to get instead of the hyphen. IF you are always getting a "~" and an "i" as alternatives, then try:
mohan_sekarAuthor Commented:
I've slightly modified Wilg32's expression to suit my requirements. Thanks, Wilg32.
Thanks for your help, Hielo.
mohan_sekarAuthor Commented:
Thanks, Wilg32
Pawel WitkowskiSenior Javascript DeveloperCommented:
I just glad that I can help, sorry that I couldnt help further but I was playing volleyball ^^
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