python regular expressions sample for replacing strings using wildcards

regex_sample.py

import re
strings = ['abc@1@xyz','abc@2@xyz','abc@789@xyz','abc@defghijklmno@xyz']

for text in strings:
    regextest = re.sub("@.*@",str(strings.index(text)),text) # .* means zero or more of any character
    print regextest

'''expected output
abc0xyz
abc1xyz
abc2xyz
abc3xyz
'''