import re
 
regex = r"^Encryption Algorithms:([\w-]+(?:,[\w-]+)*)"
 
test_str = ("SSH Enabled - version 2.0\n"
            "Authentication methods:publickey,keyboard-interactive,password\n"
            "Encryption Algorithms:aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc\n"
            "MAC Algorithms:hmac-sha1,hmac-sha1-96\n"
            "Authentication timeout: 120 secs; Authentication retries: 3\n"
            "Minimum expected Diffie Hellman key size : 1024 bits\n"
            "IOS Keys in SECSH format(ssh-rsa, base64 encoded):")
 
matches = re.search(regex, test_str, re.MULTILINE)
if matches:
    print(matches.group(1).split(","))

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