Regex pattern for a number within a number -

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Can someone think of a better way of writing it? It works, but it's a bit ugly.

The input data looks like this: 125100001

The first two numbers are years, the numbers are the next two weeks, and the last 5 are serials. I want to make sure that the number of weeks is not more than 52 for one option. Originally to take advantage of just $ error area :)

Here it is: 

  ^ \ d \ d (0 [0-9] | 1 [0] -9]] | 2 [0-9] | 3 [0-9] | 4 [0-9] | 5 [0-2]) {1} \ d {5} $

For only part of the week: 

  [0-4] \ d | 5 [0- 2]

then the entire regex will be:


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