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I am working on creating a regex to match the various credit card numbering
patterns. I am unsure of my syntax. I believe it to be correct, however in
one regex syntax verification application I am using, I receive an error
stating that there is an invalid use of a repeat. I tried to verify each
card's regex, and received the same response. Here is the regex I am using
for MasterCard patterns.
It should match a pattern of
xxxx xxxx xxxx xxxx
The first digit will be a 5, the second will be from a range of 1-5.
Is my syntax incorrect or is my syntax verifier application?
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