Question

I am trying to create a regular expression which will look for a email address after Cc field in the email header. I don’t have programming control on the string, so its not specific to any particular programming language. It’s just a part of integration of some software which expects some regular expression in a search criteria

The email header looks like this:

Received: by hermit.cdu-staff.local 
    id <[e-mail]>; Thu, 9 Feb 2012 13:57:14 +0930
MIME-Version: 1.0
Content-Type: multipart/alternative;
    boundary="----_=_NextPart_001_01CCE6E3.19910AB8"
Content-class: urn:content-classes:message
X-MimeOLE: Produced By Microsoft Exchange V6.5
Subject: Email header example
Date: Thu, 9 Feb 2012 13:57:10 +0930
Message-ID: <[e-mail]>
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
Thread-Topic: Email header example
Thread-Index: Aczm4xa7dGVpHUWERSSOuR8HCNmrAw==
From: "Bishnu Paudel" <[e-mail]>
To: "Study" <[e-mail]>
Cc: "Cameron Loudon" <[e-mail]>

I have created a regular expression which works great if the string is a one line string (the last line in the header). Here is the expression

(^|,)\s*.*Cc:.*(bishnu.paudel|cameron.loudon)@company[.]com\s*($|,).

Any help would greatly be appreciated.

Answer 1

The following regex should solve the problem

\b[A-Z0-9._%+-][e-mail]\b

which is an adaption of the regex presented here. Please note the comments on the original website on what a ‘valid’ e-mail address is defined as.