I am having trouble with a commonly used Regex for validating email addresses. The expression is as follows;

^$|^(([^<>()[]\.,;:\s@\""]+(.[^<>()[]\.,;:\s@\""]+)*)|(\"".+\""))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$

This expression works fine when validating a doc type property, but when used for validating a text field in a form created with Umbraco Forms 7 has the unusual effect of rendering just part of the expression (see image) and the validation of course doesn't fire. I don't know if it's due to the presence of double quotes in the expression, but any help in getting a workaround for this would be appreciated.