Customising contact us form to allow "+" and "-" characters in telephone number field

Hi, I have a shopify store using the dawn theme with a “contact us” form. The form has a telephone number field. The telephone number field only allows entering numbers [0-9]. Probably coz the pattern attribute in contact-form.liquid is set to pattern=“[0-9-]*”. Is there a way to edit the pattern attribute to allow entering “+” and “-” in the telephone number field?

Current state → Tel No. Field allows entering phone number in the form “0616116998”

Desired state → Tel No. Field allows entering phone number like above as well as “+66616116998” and “+66-616116998”

Help would be much appreciated :folded_hands:

thank you so much Sonya, this worked.