Reuse part of a Regex pattern

Question

Consider this (very simplified) example string:

1aw2,5cx7

As you can see, it is two digit/letter/letter/digit values separated

Answer 1

Note: this will work with PyPi regex module, not with re module.

You could use the notation (?group-number), in your case:

(\d\w\w\d),(?1)

it is equivalent to:

(\d\w\w\d),(\d\w\w\d)

Be aware that \w includes \d. The regex will be:

(\d[a-zA-Z]{2}\d),(?1)