import re
myString = "Test1 [cm]: -35.00/-34.99/-34.00/0.09"
print re.search(r'(?<=\/)[+-]?\d+(?:\.\d+)?', myString).group()
aW1wb3J0IHJlIApteVN0cmluZyA9ICJUZXN0MSBbY21dOiAgICAgLTM1LjAwLy0zNC45OS8tMzQuMDAvMC4wOSIgCnByaW50IHJlLnNlYXJjaChyJyg/PD1cLylbKy1dP1xkKyg/OlwuXGQrKT8nLCBteVN0cmluZykuZ3JvdXAoKQo=