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Python Regular Expressions in Python Introduction to Regular Expressions Name Groups

Yosef Cohen
PLUS
Yosef Cohen
Courses Plus Student 4,096 Points

why it's returns error ???

it's tell me about error in the "last name" group , i checked it and i don't understand the problem. the question is : Create a variable names that is an re.match() against string. The pattern should provide two groups, one for a last name match and one for a first name match. The name parts are separated by a comma and a space. the error is : Bummer! error: bad character in group name 'last name' at position 25 (line 3, column 5)

names.py
import re

string = 'Perotto, Pier Giorgio'
names=re.match("""
(?P<name>\b[\w]+,\s)
(?P<last name>\b[\w]+\s[\w]+)
""",string,re.X)