If the current character of the first string is not an alphanumeric character , increase the pointer i
while ( i < len1 && ( ! ( ( str1 [ i ] . charCodeAt ( ) >= ' ' . charCodeAt ( ) && str1 [ i ] . charCodeAt ( ) <= ' ' . charCodeAt ( ) ) || ( str1 [ i ] . charCodeAt ( ) >= ' ' . charCodeAt ( ) && str1 [ i ] . charCodeAt ( ) <= ' ' . charCodeAt ( ) ) || ( str1 [ i ] . charCodeAt ( ) >= ' ' . charCodeAt ( ) && str1 [ i ] . charCodeAt ( ) <= ' ' . charCodeAt ( ) ) ) ) ) { i ++ ; }