diff --git a/src/EDI/Parser.php b/src/EDI/Parser.php
index e1bec00..9166f7a 100644
--- a/src/EDI/Parser.php
+++ b/src/EDI/Parser.php
@@ -522,10 +522,10 @@ private function unwrap(string &$string): array
             $this->errors[] = 'This file contains some segments without terminators';
         }
 
-        $terminatorRegex = '/(([^'.$this->symbRel.']'.$this->symbRel.'{2})+|[^'.$this->symbRel.'])'.$this->symbEnd.'|[\r\n]+/';
+        $terminatorRegex = '/((?<!'.$this->symbRel.')(?:'.$this->symbRel.$this->symbRel.')*)'.$this->symbEnd.'|[\r\n]+/';
 
         if ($this->strict) {
-            $terminatorRegex = '/(([^'.$this->symbRel.']'.$this->symbRel.'{2})+|[^'.$this->symbRel.'])'.$this->symbEnd.'/';
+            $terminatorRegex = '/((?<!'.$this->symbRel.')(?:'.$this->symbRel.$this->symbRel.')*)'.$this->symbEnd.'/';
         }
 
         $string = (string) \preg_replace(