Python: how to split string by groups Alpha-numeric vs numeric

Question

Lets say I have Strings like: "H39_M1", "H3_M15", "H3M19", "H3M11", "D363_H3", "D_128_H17_M50"

How can I split them every single one into a list of substrings? like this:

["H39", "M1"], "[H3, "Min15"], ["H3","M19"], ["H3","M11"], ["D363","H3"], ["D128","H17","M50"]

and afterwards: switch places of alphanumeric-group and numeric group, like this: ["39H", "1M"], "[3H, "15Min"], ["3H","19M"], ["3H","11M"], ["363D","3H"],["128D","17H","50M"]

length of numbers-group and of alphanumeric group varys as you can see. also "_" underscores can divide them.

Answer 1

I might suggest using re.findall here with re.sub :

inp = "H3M19"
inp = re.sub(r'([A-Z]+)([0-9]+)', r'\2\1', inp)
parts = re.findall(r'[0-9]+[A-Z]+', inp)
print(parts)

This prints:

['3H', '19M']

The first re.sub step converts H3M19 into 3H19M , by capturing the letter and numeric pairs and then swapping them. Then, we use re.findall to find all number/letter pairs in the swapped input.