re.search - example

import re

print('re: search')
print('-' * 30, '\n')

time_str = 'some 1:02:34.05 time'
time_str = 'some time'
time_str = 'some 34 time'

res = re.search('([\:\d]+)[\.,](\d+)', time_str)

if res:
    print('res =',res)
    print('res.string =',res.string)
    print('res.groups() =',res.groups())
    print('res.group(0) =',res.group(0))
    print('res.group(1) =',res.group(1))
    print('res.group(2) =',res.group(2))
    print('res.lastindex =',res.lastindex)
else:
    print('not found')