regex - jQuery allow specific numbers for mobile number -

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i want allow enter mobile number these combinations(7 or 8 or 9).

i restricting alphabets(allow numbers) how restrict numbers other 7 or 8 or 9. 

$(document).on('keypress', '.mobnum', function (e) {        //if letter not digit display error , don't type        if (e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) {            if (e.which == 118){              return true;            }else{              return false;            }       }      });

use following function restict mobile number

$(document).on('keypress', '.mobnum', function (e) {     var mobnum="987654321";     if (mobnum === ''|| mobnum === 'null'|| mobnum === null || phonenumber(mobnum)=== false)      {     }     else     {     operations     } });     function phonenumber(mobnum) {     var pattern = new regexp(/^[789]\d{9}$/i);     return pattern.test(mobnum);     };

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