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
aW1wb3J0IHJlCnAgPSByZS5jb21waWxlKHIndGVzdFxzKjpccyooLiopJykKcyA9ICJ0ZXN0IDogbWF0Y2ggdGhpcy4iCm0gPSBwLnNlYXJjaChzKSAgICAgICAgICAgIyBSdW4gYSByZWdleCBzZWFyY2ggYW55d2hlcmUgaW5zaWRlIGEgc3RyaW5nCmlmIG06ICAgICAgICAgICAgICAgICAgICAgIyBJZiB0aGVyZSBpcyBhIG1hdGNoCglwcmludChtLmdyb3VwKDEpKSAgICAgIyBQcmludCBHcm91cCAxIHZhbHVl