How to have a Form Field require a certain text format

Hey there,

I have a webform for new hires where managers can fill out to submit a ticket. One of the fields is a text field for them to enter the email address of the new hire. We are getting requests where it is just the new hires name rather than the email. 

Is there some code that I can add that will make this field require a certain format? ie. @domain.com

Thank you!