Thanks Monks.. The formatting code will be below where there will be $1, $2 and $3 values. 

( /^BAK(\w+)\s+(\d+)\s+([\w\_]+)\s*/i )

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But I still do not understand the use of =$1; and $3; at end of code for below two lines. 
        $bakjobs->{"$2"}{"dbt"} = $1;
        $bakjobs->{"$2"}{"cdt"} =$3;

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Please explain.. Appreciate your help..

In reply to Re^2: Understanding -> function by John007
in thread Understanding -> function by John007

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