regex to match comma separated aws regions in python

String has multiple data and need to find the match and get the value of comma separated aws regions

data = '''
appname=ivr
age=2years
region='us-east-1a,us-east-2a,us-east-1c'
'''

Would like to get the value for region in out put as 'us-east-1a,us-east-2a,us-east-1c'

tried using this regex but it works only for one value without comma

'(af|il|ap|ca|eu|me|sa|us|cn|us-gov|us-iso|us-isob)-(central|north|.       (north(?:east|west))|south|south(?:east|west)|east|west)-\d{1}'

>Solution :

You could just add an optional comma on the end of your regex and then make that a repeating group:

pat = r'((?:af|il|ap|ca|eu|me|sa|us|cn|us-gov|us-iso|us-isob)-(?:central|north(?:east|west)?|south(?:east|west)?|east|west)-\d+[a-z]?,?)+'

out = re.search(pat, data)
print(out.group())

Output:

us-east-1a,us-east-2a,us-east-1c