How to extract the substring between two markers?

Question

Let\'s say I have a string \'gfgfdAAA1234ZZZuijjk\' and I want to extract just the \'1234\' part.

I only know what will be the few characte

Answer 1

>>> s = '/tmp/10508.constantstring'
>>> s.split('/tmp/')[1].split('constantstring')[0].strip('.')