C:\test\perl>perl tle.pl
ENVELOPEID 36
CUSTOMER_NAME 36
KUNDNAVN 36
ZIP_CODE 36
COUNTRY 36
FAKTURA 36
KONTRAKT 36
REGISTER 36
DATO 36

##</code><code>##

ENVELOPEID 5172986
CUSTOMER_NAME Acme Inc
KUNDNAVN BANANA AIRLINES
ZIP_CODE SE-971 74
.. 

##</code><code>##

use strict;
use warnings;

use 5.010;
my $file;

{
  local $/;
  $file = <DATA>;
}

while ($file =~ /TLE.*?FQName\W+'(.*?)'.*?'(.*?)'.*?(TLE)?/gs ) {
  say "$1 $2";
}

__DATA__
.11893 ... TLE - Tag Logical Element                          00033 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'ENVELOPEID'
           |Attribute Value Triplet 54 (x'36')
           |- '5172986'
.11894 ... TLE - Tag Logical Element                          00059 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'CUSTOMER_NAME'
           |Attribute Value Triplet 54 (x'36')
           |- 'Acme Inc'
.11895 ... TLE - Tag Logical Element                          00074 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'KUNDNAVN'
           |Attribute Value Triplet 54 (x'36')
           |- 'BANANA AIRLINES'
.11896 ... TLE - Tag Logical Element                          00033 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'ZIP_CODE'
           |Attribute Value Triplet 54 (x'36')
           |- 'SE-971 74'
.11897 ... TLE - Tag Logical Element                          00025 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'COUNTRY'
           |Attribute Value Triplet 54 (x'36')
           |- 'SE'
.11898 ... TLE - Tag Logical Element                          00030 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'FAKTURA'
           |Attribute Value Triplet 54 (x'36')
           |- '5643452'
.11899 ... TLE - Tag Logical Element                          00032 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'KONTRAKT'
           |Attribute Value Triplet 54 (x'36')
           |- '90234342'
.11900 ... TLE - Tag Logical Element                          00031 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'REGISTER'
           |Attribute Value Triplet 54 (x'36')
           |- 'AF89729'
.11901 ... TLE - Tag Logical Element                          00028 D3A090 00000
           |
           |Fully Qualified Name Triplet 2 (x'02')
           |- Type 11 (x'0B') Attribute GID
           |- Format 0 (x'00') Character string
           |- FQName 'DATO'
           |Attribute Value Triplet 54 (x'36')
           |- '16.12.13'