I have to search many files that can be upwards of 1M lines. I need to find about 10 fields through the entire file store their value in a hash.
The method I am using works fine, but I think it is very fragile. If anything would be out of order, my method fails.
What I have done is this:
Store my fields in an array in the order I am guessing they appear 
    my %SEARCH_FIELDS = (
        '1.X'   =>  [qw!RESULT_T LOTID DEVICEID SETUPID STEPID OMARK D
+IEPITCH WAFERID SLOTID CENTER DEFECTS!],
        '1.8'   =>  [qw!LOTID WAFERID RESULT_T CENTER SLOTID DEFECTS D
+EVICEID DIEPITCH OMARK SETUPID STEPID!],
    );

[download]
I store my regex in a hash for searching: 
my %KLARF_REGEXP = (
    '1.X'   =>  {
                    'LOTID'     => qr/LotID "(.+)";/i,
                    'DEVICEID'  => qr/DeviceID "(\w+)";/i,
                    'STEPID'    => qr/StepID "(.+)";/i,
                    'SLOTID'    => qr/Slot (\d+);/i,
                    'DEFECTS'   => qr/DefectList/i,
                    'RESULT_T'  => qr/ResultTimestamp (.+);/i,
                    'WAFERID'   => qr/WaferID "(.+)";/i,
                    'SETUPID'   => qr/SetupID (.+);/i,
                    'OMARK'     => qr/OrientationMarkLocation (.+);/i,
                    'DIEPITCH'  => qr/DiePitch (.+);/i,
                    'CENTER'    => qr/SampleCenterLocation (.+);/i,
                },
    '1.8'   =>  {
                    'LOTID'     => qr/LotRecord "(.+)"/i,
                    'DEVICEID'  => qr/DeviceID 1 \{"(\w+)"\}/i,
                    'STEPID'    => qr/StepID 1 \{"(.+)"\}/i,
                    'SLOTID'    => qr/Field SlotNumber 1 \{(\d+)\}/i,
                    'DEFECTS'   => qr/DefectList/i,
                    'WAFERID'   => qr/WaferRecord "(.+)"/i,
                    'RESULT_T'  => qr/Field ResultTimestamp \d \{(.+)\
+}/i,
                    'SETUPID'   => qr/Field RecipeID 3 \{(.+)\}/i,
                    'OMARK'     => qr/Field OrientationMarkLocation 1 
+\{(.+)\}/i,
                    'DIEPITCH'  => qr/Field DiePitch \d \{(.+)\}/i,
                    'CENTER'    => qr/Field SampleCenterLocation \d \{
+(.+)\}/i,
                },
);

[download]
I then shift off the current $search_field and run until I successfully have a match. Upon a successful match, I shift off the next value. 
while ( <FILE> ){
    if ( $_ =~ $KLARF_REGEXP{$KLARF_VERSION}{$current_state} ){
        $summary->{$current_state} = $1 if $1;
        LogMsg( "Found $current_state $summary->{$current_state}" ) if
+ $summary->{$current_state};
        $current_state = shift @{$SEARCH_FIELDS{$KLARF_VERSION}};
    }
}

[download]
Is there another better faster stronger way to do what I am doing and not have to hard code the search order? I thought about iterating every line over every possibe regex, but I don't know if that is the best method. The machine that runs this process is already heavily utilized, so I am looking for a memory / processor efficient way to do this.

In reply to Searching Array To Hold RegEx Stack Is Order Dependant by ~~David~~

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