问题
The string should not contain SSN or phone number. The regex below does not work, it accepts only xxxxxxxxx format.
Should not contain xxx-xx-xxxx or xxx-xxx-xxx or xxxxxxxxx.
regex = "^((?!\\d[9]$)|(?!(\\d{3}-?\\d{2}-?\\d{4}$)|(?!(\\d{3}-?\\d{3}-?\\d{3})$)$";
回答1:
You might try:
^(?!((\\d{9})|(\\d{3}-\\d{2}-\\d{4})|(\\d{3}-\\d{3}-\\d{3}))$).*
To explain, if we read the query you provided:
^((?!\\d[9]$)|(?!(\\d{3}-?\\d{2}-?\\d{4}$)|(?!(\\d{3}-?\\d{3}-?\\d{3})$)$
We could read that: is not followed by xxxxxxxxx OR is not followed by xxx-xx-xxxx OR is not followed by xxx-xxx-xxx (in my version at the top, I rephrased this to be: is not (xxxxxxxxx OR xxx-xx-xxxx OR xxx-xxx-xxx).).
Any string in the world is guaranteed to not match at least two of those, so the combination of them is always true, leaving you with a much simpler effective regex:
^$
?! is a zero-width assertion, so it consumes nothing. Even when you match what's checked by the lookaheads, you aren't consuming the input, and so you never reach $, that's required outside the lookaheads. Simply adding a .* before the final $ fixes that.
Your hyphens shouldn't be followed by ?, I don't think. Making them optional, means you also match xxx-xxxxxx and xxx-xx-x-xxx. If that's intended you can add them back, or simplify your regex considerably, to:
^(?!\\d{3}-?\\d{2}-?\\d-?\\d{3}$).*
The other problem is \\d[9]$ should be \\d{9}$
来源：https://stackoverflow.com/questions/14103840/regular-expression-for-ssn-and-phone-number