import re
rx = r'-(?:[A-Za-z]+[0-9]|[0-9]+[a-zA-Z])[0-9a-zA-Z]*-'
text = r'k8s-configuration-int-mbus_config-int-mbus-deployment-db9c64cd-n4tww_central_6d499584'
result = re.split(rx, text, 2)
print(result[0])
aW1wb3J0IHJlCnJ4ID0gcictKD86W0EtWmEtel0rWzAtOV18WzAtOV0rW2EtekEtWl0pWzAtOWEtekEtWl0qLScKdGV4dCA9IHInazhzLWNvbmZpZ3VyYXRpb24taW50LW1idXNfY29uZmlnLWludC1tYnVzLWRlcGxveW1lbnQtZGI5YzY0Y2QtbjR0d3dfY2VudHJhbF82ZDQ5OTU4NCcKcmVzdWx0ID0gcmUuc3BsaXQocngsIHRleHQsIDIpCnByaW50KHJlc3VsdFswXSk=