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Language/Type: General regular expressions
Author: Melissa Hovik (on 2018/06/01)

Write a regular expression that will match each of the following patterns:

Non-negative 7-digit numbers
A 16-digit credit card number, with optional dashes for every four digits
A 16-digit credit card number, with the first digit being a 5 and the second digit being a 1, 2, 3, 4, or 5 (the rest of the digits can be anything). Do not match any dashes in this expression.
A real number such as 3.14, -0.2018, or 1 (must have a digit before and after decimal point)

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