__DATA__
Reach Holly Smith for help by sending an email\nto hollysmith@nosuchdomain.com.~For more information, contact Holly Smith.
For more information, contact Holly Smith at\nhollysmith@nosuchdomain.com.~For more information, contact Holly Smith.
For more information, contact Holly Smith at (800) 555-1212 or\nvia email to hollysmith@nosuchdomain.com~For more information, contact Holly Smith.

##</code><code>##

    if ($slurped_file =~ s/\Q$old_string\E/$new_string/g ) {

##</code><code>##

    if ($slurped_file =~ s/$old_string/$new_string/g ) {

##</code><code>##

__DATA__
Reach Holly Smith for help by sending an email\nto hollysmith@nosuchdomain\.com\.~For more information, contact Holly Smith.
For more information, contact Holly Smith at\nhollysmith@nosuchdomain\.com\.~For more information, contact Holly Smith.
For more information, contact Holly Smith at \(800\) 555-1212 or\nvia email to hollysmith@nosuchdomain\.com~For more information, contact Holly Smith.