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Regex Question

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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