import re
p = re.compile(r'test\s*:\s*(.*)\.')
s = "test : match this."
m = p.search(s) # Run a regex search anywhere inside a string
if m: # If there is a match
print(m.group(1)) # Print Group 1 value
aW1wb3J0IHJlCnAgPSByZS5jb21waWxlKHIndGVzdFxzKjpccyooLiopXC4nKQpzID0gInRlc3QgOiBtYXRjaCB0aGlzLiIKbSA9IHAuc2VhcmNoKHMpICAgICAgICAgICAjIFJ1biBhIHJlZ2V4IHNlYXJjaCBhbnl3aGVyZSBpbnNpZGUgYSBzdHJpbmcKaWYgbTogICAgICAgICAgICAgICAgICAgICAjIElmIHRoZXJlIGlzIGEgbWF0Y2gKCXByaW50KG0uZ3JvdXAoMSkpICAgICAjIFByaW50IEdyb3VwIDEgdmFsdWU=