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In [1]: import re
In [2]: pattern = "ab(cd)"
In [3]: string = "ababcdefds"
In [4]: result = re.search(pattern, string)
In [5]: print(result)
<_sre.SRE_Match object; span=(2, 6), match='abcd'>
In [6]: print(re.compile(pattern).findall(string))
['cd']
print(result.group(1))