C Type integrity libraries

Dear list,

Operating systems provide different internationalization settings.

locale -a lists many: various date, number, monetary and other type formats. Variables can be printed with local type format.

How about integrity checking?

If an application (or a database) needs a variable value in a certain format (types format), how to check that the variables value is in the format? This is called integrity checking or verification.

What libraries can be used to typecheck? Officially with the operating system or other?

Some types need some kind of a computation not found from the regular expressions. Regexp is an automated tool. Is it secure enough?

With kindest regards, escape
 
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