Any number greater than 14 means:

• Any number with 3 or more digits with possible leading 0's
• Any number with 2 digits where the first digit in in the character class [2-9]
• Any number with 2 digits where the first digit is 1 and the second digit in in the character class [5-9]

Inspired by: https://stackoverflow.com/questions/52700629/to-match-any-number-greater-than-15-using-regexp