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Taha Khan 7Taha Khan 7 

change validation rule on Opportunity to trigger using custom settings.

Hi All,
I am very new to development and aI have to change one validation rule into trigger using custom settings.
For example:Validation rule on an opportunity has some profiles, some roles and stage 
something like below-
ISPICKVAL(StageName ,"Pending"), 
ISPICKVAL(StageName ,"Closed") , 
$Profile.Name <> " Contractor", 
$UserRole.Name <> "Analyst")

and I need to change this validation rule into trigger.
I can move this hardcoded values to custom settings,but I am not sure how to write a trigger .
Could someone please help me.
All help is highly appreciated