Hopefully a more complete and self contained example for haukex explanation:

#!/usr/bin/env perl

use v5.10;
use strict;
use warnings;

use Math::BigInt;

use constant offset => Math::BigInt->new('0x500000000');

while (my $line1 = <DATA>) {
    # if addr 0x10000 written like 0x010000 then
    # 0x(?:[[:xdigit:]]{2})+)\b may validate memory address
    my ($addr) = $line1 =~ /addr:(0x[[:xdigit:]]+)\b/;

    #    print "addr is $addr\n";
    if (defined $addr) {
        my $new_addr = sprintf "0x%x", hex($addr) + offset;
        if ($line1 =~   s/ \baddr: \K $addr (?=\s+qospri:)
                        /$new_addr/x
        ) {
            print $line1;
        }
        else {
            print STDERR "unchanged\n";
            print $line1;
        }
    }
}

__DATA__
chn:req mon:orig cmd:SDP_CMD_WRSIZEDFULL tag:0x3b9aca01 addr:0xdf7780 
+qospri:0 len:0xf

[download]

Update: requirement for even number of digits removed thanks to explanation from AnamalousMonk.

Ron

In reply to Re: Performing addition on hex value extracted from a string by mr_ron
in thread Performing addition on hex value extracted from a string by syedasadali95

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