For more vectors please visit the XSS cheat sheet

03/ ).replace( /^(0[1-9]|1[0-2])$/g, '$1/' // 11 > 11/ ).replace( /^1([3-9])$/g, '01/$1' // 13 > 01/3 //UPDATED by NAVNEET // ).replace( // /^(0?[1-9]|1[0-2])([0-9]{2})$/g, '$1/$2' // 141 > 01/41 ).replace( /^0\/|0+$/g, '0' // 0/ > 0 and 00 > 0 //UPDATED by NAVNEET ).replace( /[^\d|^\/]*/g, '' // To allow only digits and `/` //UPDATED by NAVNEET ).replace( /\/\//g, '/' // Prevent entering more than 1 `/` ); } </script></body> </html>