import re
ip = "{kevin.knerr, sam.mcgettrick, mike.grahs}@google.com.au"
arr = re.match(r"\{([^\}]+)\}(\@\S+$)", ip)
#Using split for solution
for x in arr.group(1).split(","):
print (x.strip() + arr.group(2))
#Regex Based solution
arr1 = re.findall(r"([^, ]+)", arr.group(1))
for x in arr1:
print (x + arr.group(2))
aW1wb3J0IHJlCgppcCA9ICJ7a2V2aW4ua25lcnIsIHNhbS5tY2dldHRyaWNrLCBtaWtlLmdyYWhzfUBnb29nbGUuY29tLmF1IgkKYXJyID0gcmUubWF0Y2gociJceyhbXlx9XSspXH0oXEBcUyskKSIsIGlwKQoKI1VzaW5nIHNwbGl0IGZvciBzb2x1dGlvbgoKZm9yIHggaW4gYXJyLmdyb3VwKDEpLnNwbGl0KCIsIik6CglwcmludCAoeC5zdHJpcCgpICsgYXJyLmdyb3VwKDIpKQoKI1JlZ2V4IEJhc2VkIHNvbHV0aW9uCgphcnIxID0gcmUuZmluZGFsbChyIihbXiwgXSspIiwgYXJyLmdyb3VwKDEpKQpmb3IgeCBpbiBhcnIxOgoJcHJpbnQgKHggKyBhcnIuZ3JvdXAoMikp