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RegEx on multiple lines that might be large with look-ahead can really slow things down.

There is no need to hold onto chunks of anything - all you need is the PC name and you are fine up to when you see the next PC name.

The following chunk of code does that:

use strict ; use warnings ; my @log_data = <DATA> ; my $current_pc_name ; foreach my $log_line ( @log_data ) { chomp( $log_line ); next unless( $log_line ) ; my ( $left, $right ) = split( /\:/, $log_line ) ; if( $left eq 'PCName' ) { $current_pc_name = $right ; next ; } unless( $current_pc_name ) { die( "Command $log_line assigned to no PC!!" ) ; } print "PCName:$current_pc_name\n" ; print "$log_line\n\n" ; } __DATA__ PCName: Foo1 Command1:dfie Command2:dfo Command3:dfum PCName: Foo2 Command1:dfie Command2:dfo Command3:dfum

OUTPUT:

PCName: Foo1 Command1:dfie PCName: Foo1 Command2:dfo PCName: Foo1 Command3:dfum PCName: Foo2 Command1:dfie PCName: Foo2 Command2:dfo PCName: Foo2 Command3:dfum

In reply to Re: File Find/Replace with the replacement coming from part of earlier matched string by tmharish
in thread File Find/Replace with the replacement coming from part of earlier matched string by navinc

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