Matching SSNs with RegEx -


i filtering out ssn#’s project. product’s default expressions ssns is

(^|\b)(?!9|8|77[3-9]|666|000)(\d{3})( - | |-)(?!00)(\d{2})\3(?!0000)(\d{4})(\b|$)

there modification in past customized script regex expression:

(^|\b)(?!9|8|77[3-9]|666|000)(\d{3})( - | |-)(?!00)(\d{2})\3(?!0000)(\d{4})($|[^\d-])

the difference between 2 expressions 

(\b|$) \b: backspace $:end of string

and

($|[^\d-]) $:end of string [^]: not in position \d-: not match 0-9

i guess not make sense me. why change made? both of end of these expressions seem superfluous. appreciated. thanks!!

the difference here:

(\b|$)

vs

($|[^\d-])

\b represents backspace character within character class [\babc] match 'a', 'b', 'c', or backspace char. outside character class, seen here, word break, such between letter , space.

previously, regex accept ssn, matching pattern point, ending end of string ($), or word break (\b). match ssn in "111-22-3333" or "111-22-3333 garbage data"

after change, more permissive of follows ssn. can end end of string ($), or character other digit or hyphen ([^\d-]). so, matched above, match ssn in "111-22-3333garbage" or "111-22-3333#6789", not in "111-22-33333" or "111-22-3333-123"

frankly, old version list seems more correct cases me, depend on needs application, of course.


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