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

Here's a solution without regex that also accounts for scenarios where the first substring contains the second substring. This function will only find a substring if the second marker is after the first marker.

def find_substring(string, start, end):
    len_until_end_of_first_match = string.find(start) + len(start)
    after_start = string[len_until_end_of_first_match:]
    return string[string.find(start) + len(start):len_until_end_of_first_match + after_start.find(end)]