Named capture

\P P

import re

line = 'There is a phone number 12345 in this row and an age: 23'

regex = r'((?P<word>\w+) (?P<key>\w+)): (?P<value>\d+)'

match = re.search(regex, line)
if match:
    print(match.group(0))  # an age: 23
    print(match.group(1))  # an age
    print(match.group(2))  # an
    print(match.group(3))  # age
    print(match.group(4))  # 23

    print(match.group('word'))   # an
    print(match.group('key'))    # age
    print(match.group('value'))  # 23

    print(match.groups())  # ('an age', 'an', 'age', '23')
    print(len(match.groups()))  # 4

matches = re.findall(regex, line)
print(matches) # [('an age', 'an', 'age', '23')]