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