Question 359040 in Amazon Web Sevices Question posted in
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Amazon web services – 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}'
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2

Answers


  1. 0

    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
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  2. 0

    A different approach is to use the csv library to parse:

    import csv

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

reader = csv.reader(data.strip().splitlines(), delimiter="=", quotechar="'")
parsed = dict(reader)
print(parsed)
print(parsed['region'])

    Output:

    {'appname': 'ivr', 'age': '2years', 'region': 'us-east-1a,us-east-2a,us-east-1c'}
us-east-1a,us-east-2a,us-east-1c

    Notes

    • The expression data.strip().splitlines() cleans up the data and split it into lines
    • We feed those lines into a csv.reader, specifying the equal sign as the fields delimiter.
    • Each line is broken into 2 fields, we then call dict() to turn them into a dictionary.
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