Cannot understand the code for removing words with numbers [duplicate]

Question

I want to remove words with numbers. After research I understood that

 s = "ABCD abcd AB55 55CD A55D 5555"
>>> re.sub("\S*\d\S*", "", s).strip()

This code works to solve my situation

However, I am not able to understand how this code works. I know about regex and I know individually \d recognizes all the numbers [0-9]. \S is for white spaces. and * is 0 or more occurrences of the pattern to its left

"\S*\d\S*"

This part I am not able to understand

But I am not sure I understand how this code identifies AB55.

Can anyone please explain to me? Thanks

Answer 1

this replaces a digit with any non-space symbols around with empty string ""

the AB55 is viewed like : AB are \S*, 5 is \d, 5 is \S*

55CD : empty string is \S*, 5 is \d, 5CD is \S*

A55D : A is \S*, 5 is \d, 5D is \S*

5555 : empty string is \S*, 5 is \d, 555 is \S*

The re.sub("\S*\d\S*", "", s) replaces all this substrings to empty string "" and .strip() is useless since it removes whitespace at the begin and end of the previous result