Analytics links being rewritten!

I’m heaving this problem with a web. Any link from a newsletter campaign or external links build with url builder are like this utm_source= utm_medium and so on.

When these links come to the web they hit like this utm-medium, utm-source.

Dash are converted to hyphen and i loose the tracks.

I have this on functions.php

$full_url = pfc_full_url();
$qs = $_SERVER[‘QUERY_STRING’];
if(

strpos($qs,’related_musician’) === false &&
strpos($qs,’related_episode’) === false &&
strpos($qs,’related_news’) === false &&
strpos($full_url,’/the-team/’) === false &&
strpos($full_url,’/musician/’) === false &&
strpos($full_url,’wp-admin’) === false &&
strpos($full_url,’wp-login’) === false &&
strpos($full_url, ‘_’) !== false)
{
$full_url = str_replace(‘_’, ‘-‘, $full_url);
header(“Location: $full_url”, true, 301);
die;
}

and this in formatting.php
$title = str_replace(‘.’, ‘-‘, $title);

i understand that if i change str_replace all my old posts will be not found.

Any way of add an exception to external links??

Thank you

Jeffe