Add log feature to script: "Replace " " with « » inside the xml files"

Feature Request on below script please.
- Create log file to list names of those files changed by ->  if s/(<title>.*?)"(.*?)"/$1«$2»/s;

100 Bonus points due to slight urgent need...

use open ':utf8';
use File::Find;

    print STDERR "$File::Find::name\n";
    return unless /\.xml$/;
    local @ARGV=($_);local $^I=".bak";
    while( <> ){ print STDERR "$1«$2»\n" if s/(<title>.*?)"(.*?)"/$1«$2»/s; print; }
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open LOG,">>logfile");
    return unless /\.xml$/;
    local @ARGV=($_); local $^I=".bak"; local $/="</title>"; local $changed;
    while( <> ){ $changed=1 if s/(<title>.*?)"(.*?)"/$1«$2»/s; print; }
    print LOG "$File::Find::name changed\n" if $changed;
close LOG;

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