asp.net - Regex to validate email with name.surname@fixed domain -


i wonder if 1 can give me hand on this. need validate email addresses name.surname@domain.com domain.com , dot between name , surname same. use asp validator not know how write regex yet.

<asp:regularexpressionvalidator id="validateemail"     runat="server" errormessage="invalid email." controltovalidate="txtemail"  validationexpression="???????????" />

^[a-za-z0-9_]+\.[a-za-z0-9_]+@domain.tld$ allow characters a-z, a-z, 0-9 , underscore in first , last names , require domain in end. first , last names have have @ least 1 character.

you can change character set depending on requirements , not sure if need ^ or $ in there, if validation expression automatically assumes whole string.


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