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I’m building up a library of filters for a validation class in PHP, some of them using regular expressions. I have a lot of filters in mind, but I also don’t want to potentially miss any. What do you most often use regular expressions to check? What are some of the not-so-common things that you’ve had to check that would still be useful in a library? Note: I’m not looking for the actual regex code, just what you use it for.
Regex should be strongly tested with their expected use cases. Hence, it may be difficult to develop a complete and general library. I would aim for a library of functions you know you need now. Then add to this list later, when you have proper test cases.
That said, here are some common use cases:
Numeric Data
Phone numbers
Dates
Zip codes
SSN