fix multicharactor with utf-8 encoding

Author: Jochen Pfaeffle

src/EDI/Parser.php

@@ -157,7 +157,9 @@ public function parse(): self
 
             // Basic sanitization, remove non-printable chars.
             $lineTrim = \trim($line);
-            $line = (string) \preg_replace($this->stripChars, '', $lineTrim);
+            if (mb_detect_encoding($line, mb_list_encodings()) !== 'UTF-8') {
+                $line = (string) \preg_replace($this->stripChars, '', $lineTrim);
+            }
             $line_bytes = \strlen($line);
 
             if ($line_bytes !== \strlen($lineTrim)) {