Match against 'root: hisemail' 01234567890123 1) ok! pos = 0. (zw) 2) ok! Found a 'root:' at pos 0 through 4. pos = 5. 3) ok! Found 1 '\s' at pos 5. pos = 6. 4) ok! Found something other than 'email' at pos 6. pos = 6. (zwla) (found 'hisemail') 5) ok! Found a '\S' at pos 6. pos = 6. Match!