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Regular Expression
r"
^From:(.*?)To:(.*?)Subject:(.*?)$(.*?)(?=^From:|\Z)
"
gms
Input 1
From: 'Mark Twain' <mark.twain@gmail.com> To: 'Edgar Allen Poe' <eap@gmail.com> Subject: RE:Hello! Ed, I just read the Tell Tale Heart. You\'ve got problems man. Sincerely, Marky Mark From: 'Edgar Allen Poe' <eap@gmail.com> To: 'Mark Twain' <mark.twain@gmail.com> Subject: RE: Hello! Mark, The world is crushing my soul, and so are you. Regards, Edgar
Extraction
From: 'Mark Twain' <mark.twain@gmail.com> To: 'Edgar Allen Poe' <eap@gmail.com> Subject: RE:Hello! Ed, I just read the Tell Tale Heart. You\'ve got problems man. Sincerely, Marky Mark From: 'Edgar Allen Poe' <eap@gmail.com> To: 'Mark Twain' <mark.twain@gmail.com> Subject: RE: Hello! Mark, The world is crushing my soul, and so are you. Regards, Edgar