How to match optional string while reading a email header

Fri, 13 Aug 2010 15:08:04 -0700

Hello All,

I am trying to fetch some information from the email header. I am piping the mail to my script and want to fetch the particular content from the header but I am having difficulties to fetch it.

My seacrh string is as given below.
===========================
my $test = '(From) (\S*@*\S*)(\s*)(\S*\s*\S*\s*\S*\s*\S*\s*\S*)(s*)(. *)(\s*)(id)(\s*)(\w\w\w\w\w\w-\w\w\w\w\w\w-\w\w*)(\s*)(for email@domain_name.com)(\s*)(;)(\s*)(\S*\s*\S*\s*\S *\s*\S*)(\s*)(\d\d:\d\d:\d\d)(.*)(\s*)(Subject:)(\ s*)(.*)(\s*)(From:|Message-Id:)(\s*)(.*)';
============================

It is working well if mail header does not have any one value in it out of (From:|Message-Id:) but if the mail header have both of them then it is printing the Subject line along with the Message_Id or From: which ever is there in the header first.
For example I am getting the Subject line as below :
Subject=>test from test email ID Message-Id: <E1Ok1yC-0006AT-Co@domain_name.com>

I want to select only subject filed. Is there any way to strip both of them using the regex.

I also want to know if there is any way to replace new line character with string in a multi-line string.
I tried to replace with it space and it is working but if I am trying it with string such as $$$$$ or :::: my script is not executing itself.

Thank you

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How to match optional string while reading a email header