Validating regexp

[Chris Angelico]

On Wed, Aug 9, 2017 at 2:37 AM, Larry Martell <larry.martell at gmail.com> wrote:
> Anyone have any code or know of any packages for validating a regexp?
>
> I have an app that allows users to enter regexps for db searching.
> When a user enters an invalid one (e.g. 'A|B|' is one I just saw) it
> causes downstream issues. I'd like to flag it at entry time.

re.compile()? Although I'm not sure that 'A|B|' is actually invalid.
But re.compile("(") throws.

ChrisA