Help with a regular expression - Python

Question

Lets assume I have the following string:

string = "xxx abc123 xxx"

I want the regular expression to replace the digits in the string that begin with 'abc'. I have tried the following, but with no luck:

re.sub(r'\d{1,3}\babc','456',string)

Thanks.

Answer 1

re.sub(r'(?<=abc)\d{1,3}', '456', string)