Fixes issue with partial matches.

[zm1th]

Hi. I don't know if this is a great way to fix this problem, but I thought I'd take a swing at it and see what you thought.

The problem: an invalid number is counted as valid because anchors (^, $) are ignored on a regular expression. I think this happens because the regex also has an OR / pipe operator ( | ).

Example:
Guatemala has eight digit phone numbers, but the number 5555 1234 123 still got through the matcher.

The regex:
/^[2-7]\d{7}|1[89]\d{9}$/

As you can see, the number does not match either of the sides of the expression delimited by the pipe. Probably, it should all be wrapped in parentheses or something. But, I don't want to change all the libphonenumber regex's to solve the problem, because then I can't update from their database very easily.

The solution is completely invalid if there are times that a partial match in the sections I have changed will happen. This was somewhat unclear to me, but I believe that at these points, we are matching the entire number.

Thanks.