Regex to match digits of specific length

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You can generally do ranges as follows:

\d{4,7}

which means a minimum of 4 and maximum of 7 digits. For your particular case, you can use the one-argument variant, \d{15}.

Both of these forms are supported in Python’s regular expressions – look for the text {m,n} at that link.

And keep in mind that \d{15} will match fifteen digits anywhere in the line, including a 400-digit number. If you want to ensure it only has the fifteen, you use something like:

^\d{15}$

which uses the start and end anchors, or

^\D*\d{15}\D*$

which allows arbitrary non-digits on either side.

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