RegEx on Google Forms: How to make Case Insensitive work?

Question

I have been wondering, how to use case insensitive regular expression for a response validation in a form where there are different possible answers?

I have tried:
(name1|name2|name3)
and it really works, but I want it to be case insensitive.

Is there an easiest way to make it Case Insensitive?

I did:

1. [?i(name1|name2|name3)] – it didn't work, and it accepts names that are not in the parenthesis.
2. [?i](name1|name2|name3) – same as what happened to number 1

Any help would be very much appreciated!

Answer 1

Use a non-capturing group to set flags, like this:

(?i)(name1|name2|name3)

See RE2.

Answer 2

Try using this

[?i]name1|name2|name3|

It worked on mine.