I'm looking for an API that would allow you to search strings for certain policies. For example, I would want to return strings that have a number pattern of a social security number, xxx-xx-xxxx, or maybe just a keyword(s) search. It would be nice to combine multiple policy searches into one search. Does an API like this exist out there free or paid? Preferably in C#? And if not, could you recommend where I should start looking to implement something like this myself?