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From: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>
Subject: Re: Regular Expression for the special character "|" pipe
Date: Tue, 27 May 2014 13:55:58 +0200
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On 27.05.2014 13:39, Aman Kashyap wrote:
>> On 27.05.2014 14:09, Vlastimil Brom wrote:
>>
>>> you can just escpape the pipe with backlash like any other metacharacter:
>>>
>>> r"start=\|ID=ter54rt543d"
>>>
>>> be sure to use the raw string notation r"...", or you can double all
>>
>>> backslashes in the string.
>>
> Thanks for the response.
>
> I got the answer finally.
>
> This is the regular expression to be used:\\|ID=[a-z]*[0-9]*[a-z]*[0-9]*[a-z]*\\|
>

or, and more readable:

r'\|ID=[a-z]*[0-9]*[a-z]*[0-9]*[a-z]*\|'

This is what Vlastimil was talking about. It saves you from having to 
escape the backslashes.