Please enable JavaScript to use regex101
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Regular Expression
r"
(?P<field>^[\w-]+): *(?P<value>[\s\S]+?)(?=^[\w-]+: *|\Z)
"
gm
Input 1
New
Message-ID: <1608636066635.7f830.79689714@crcvmail15.nm> Received: from 125.209.x.x (net58.219.x-x.host.lt-nn.net [91.219.x.x]) by crcvmail15.google.com with ESMTP id +844Q-zuS122aEqk5CZDZg for <test@google.com>; Received: from 125.209.x.x (net58.219.x-18.host.lt-nn.net [91.219.x.x]) by crcvmail15.google.com with ESMTP id +844Q-zuS122aEqk5CZDZg for <test@google.com>; Tue, 22 Dec 2020 11:20:58 -0000 From: "test"<from@google.com> To: test@google.com Subject:example email Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Substitution
Message-ID: <1608636066635.7f830.79689714@crcvmail15.nm> Received: from 125.209.x.x (net58.219.x-x.host.lt-nn.net [91.219.x.x]) by crcvmail15.google.com with ESMTP id +844Q-zuS122aEqk5CZDZg for <test@google.com>; Received: from 125.209.x.x (net58.219.x-18.host.lt-nn.net [91.219.x.x]) by crcvmail15.google.com with ESMTP id +844Q-zuS122aEqk5CZDZg for <test@google.com>; Tue, 22 Dec 2020 11:20:58 -0000 From: "test"<from@google.com> To: test@google.com Subject:example email Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable