Fix credit card validator #670
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Validator seems to have been allowing invalid credit cards through.
Issue seems to have started after #539.
The regex for cards starting with 62 was added to the wrong place, causing regular cards to be allowed to have extra trailing numbers and cards starting with 62 to have extra leading numbers.
You can see a visualization of the regex before and after this change here:
before: http://tinyurl.com/yaotlrhv
after: http://tinyurl.com/y7xx5vpr