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Request to add feature to the Position function - Mailing list pgsql-general

From Ron Ben
Subject Request to add feature to the Position function
Date
Msg-id ~00258D92A374E6152001107@walla.co.il
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Responses Re: Request to add feature to the Position function  (Adrian Klaver <adrian.klaver@aklaver.com>)
Re: Request to add feature to the Position function  (Mark Watson <mark.watson@jurisconcept.ca>)
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Hi,
position(substring in string)
as listed here:
locates sub string in a string.
 
It doesn't support locateing the substring from the back.
 
For example:
 
position('om' in 'Tomomas')
gives 2
 
But if I want to locate the first occurance from the back of the string it's impossible/
 
My suggestion is to create a function 
position(substring in string,order)
where order can be: begin, end
 
and it will find the string according to this parameter.
This is pretty easy to implement and should be a part of the PostgreSQL tools.
 
similar fuctionality exists in trim function where user can specify leading or taling parameter

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