If the current character of the second string is not an alphanumeric character , increase the pointer j
while ( j < len2 && ( ! ( ( str2 [ j ] . charCodeAt ( ) >= ' ' . charCodeAt ( ) && str2 [ j ] . charCodeAt ( ) <= ' ' . charCodeAt ( ) ) || ( str2 [ j ] . charCodeAt ( ) >= ' ' . charCodeAt ( ) && str2 [ j ] . charCodeAt ( ) <= ' ' . charCodeAt ( ) ) || ( str2 [ j ] . charCodeAt ( ) >= ' ' . charCodeAt ( ) && str2 [ j ] . charCodeAt ( ) <= ' ' . charCodeAt ( ) ) ) ) ) { j ++ ; }