if ($adress1 =~ /^([A-Za-z0-9öäåÖÄÅ][A-Za-zöäåÖÄÅ0-9\s\-\.\,]*)$/) {
    $adress1 = $1;
}
else {
    $adress1 = undef;
}
# and so on...

##</code><code>##

{
  $adress1 =~ /^([A-Za-z0-9öäåÖÄÅ][A-Za-zöäåÖÄÅ0-9\s\-\.\,]*)$/)
  $adress1 = $1;
}
{
  $adress2 =~ /^([A-Za-z0-9öäåÖÄÅ][A-Za-zöäåÖÄÅ0-9\s\-\.\,]*)$/)
  $adress2 = $1;
}