Issue Summary

Below regex to validate uncaptured group in email is not working

^[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}(?:,[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,})*$

Steps to Reproduce

1. Login to instance.
2. Add below Regex validation to any text or email attribute  and save

   ^[A-Za-z0-9._%+\-]{+}@[A-Za-z0-9.\-]{+}\.[A-Za-z]
   {2,}(?:,[A-Za-z0-9._%+\-]{+}@[A-Za-z0-9.\-]{+}\.[A-Za-z]{2,}
   )*$
   

1. This behaviour is seen in site with new asset architecture, with old architecture this is working as expected.

Expected Results

Regex is valid and is saved 

Actual Results

Error : We couldn’t update your attribute
The format of the regular expression is invalid.

Workaround

Currently , removing the uncaptured group and using below regex works -

 [A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}

but this does not support uncaptured group .

 A workaround for captured group  will be added here when available