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Match against 'abbbbbbc'
               01234567
...
4) ok!   Found a 'b' at pos 6.            pos = 7.
5) ok!   Found a 'c' at pos 7.            pos = 8.
Match!

Match against 'root: email'
               01234567890
...
4) ok!   Found something other than 'email' at pos 5.  pos = 5. (zwla)
         (found ' email')
Match!

Match against 'root: email'
               01234567890
...
5) fail! Did not find a '\S' at pos 5.                 Backtrack!
Nothing more to try.
No match!

Match against 'root: hisemail'
               01234567890123
...
         (found 'hisemail')
5) ok!   Found a '\S' at pos 6.                        pos = 6.
Match!