[Plugin: Fast Secure Contact Form] regex for phone numbers

Was wondering if anyone has figured out a way to implement an input mask for a telephone number field, I need to be able to accept with and without dashes and periods would be nice.
So all these would be valid
987-654-3210, 9876543210, or 987.654.3210

I am currently using this,
/\d{3}-\d{3}-\d{4}/

but that only allows with dashes

Thanks!

https://www.ads-software.com/extend/plugins/si-contact-form/