Based on this additional information, you probably mean something like this: 

foreach $exch(@exch) { 
    undef($su_adapter);
    undef($su_date);
    for($i=0; $i<=$#completefile; $i++) { 
        if($completefile[$i]=~ m/^.+\\(.+)_.+\..+?:(.+?)\s-\s(.+?)\s.+
+?\/$exch\s\|.+::(.*Up)\(\)/) { 
            $su_adapter=$1; 
            $su_date=$2; 
        }
    }
    print $su_adapter, $su_date;
}

[download]

Note that there are a bunch of easy modifications (as shown in ikegami's post) that can simplify your code and reduce its predilection for bugs.

In reply to Re^3: undef a variable for a loop by kennethk
in thread undef a variable for a loop by csiepka

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