Create a expression to cmpare a formal against a string

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_DATA_
MANAGEMENT=IDL
NORTH=IDL,NORTHERN||VIDL,NORTH||IDL,NORTH
SOUTH=IDL,SOUTHERN||CIDL,SOUTH

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<b>Expected value of $instance</b>
1. IDL_MANAGEMENT_101001
...
MANAGEMENT=IDL||VIDL
NORTH=IDL,NORTHERN||VIDL,NORTH||IDL,NORTH
SOUTH=IDL,SOUTHERN||CIDL,SOUTH

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Resultant Hash
...
IDL_SOUTH ==> SOUTH
VIDL_NORTH ==> NORTH

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