I have a input file which I am reading into a hash table, The input file is as below 

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

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Now for each key I have to check if another string say instance (This is also a string) contains the value. for example I check 15000 such instances against IDL which is the first value and then against (IDL AND NORTHERN )OR(VIDL OR NORTH) AND ( IDL OR NORTH )

Condition= TRUE if $instance contains (IDL AND NORTHERN) OR (VIDL AND NORTH) OR (IDL AND NORTH)

Please note that Value can many such OR conditions I have such 15000 instances against which I have to compare each value so need a fast method. I was thinking of passing the value to a function which would return a regex against which I can check but haven't been able to think of any such (I am new bee in perl)

What I am trying to achieve ?

i have a config file which has data like above (sample data, the number of OR can vary so can the number of commas. commas are nothing but 'AND' conditions) I have another array (instance) which can have number of strings ; now I want to check each one of these instances against each of the values in the hash; if the string in the array CONTAINS (not a direct match) the first value I move it to a new hash table; further check all the fields in the array against the value and do the same for all the present values from the config file 

<b>Expected value of $instance</b>
1. IDL_MANAGEMENT_101001
2. IDL_NORTH_TX
3. IDL_SOUTH
4. VIDL_NORTH
5. ABX_PERL

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

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WorkFlow it will match IDL (the first value) against each instant and create a hash with $instance as key and MANAGEMENT as value ; in next iteration when the key is NORTH check is done $instance contains (IDL AND NORTHERN) OR (VIDL AND NORTH) OR (IDL AND NORTH) so IDL_NORTH_TX will have a new value NORTH in the resultant hash...and hence forth 

Resultant Hash

IDL_MANAGEMENT_101001 ==> MANAGEMENT
IDL_NORTH_TX ==> NORTH
IDL_SOUTH ==> SOUTH
VIDL_NORTH ==> NORTH

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In reply to Create a expression to cmpare a formal against a string by learnP

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