[Solved] Regular Expression to find specific section of a text file

by 


regex = re.compile(".*(HEADER.*$.*A:86::ABC)", re.MULTILINE|re.DOTALL)
>>> regex.findall(string)
[u'HEADER:KHJ3\nThis is section text under header \nA match text will look like this A:86::ABC']

Hopefully this helps.
For 2 captures use ".*(HEADER.*$)(.*A:86::ABC)"

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solved Regular Expression to find specific section of a text file