diff --git a/lib/getpositions.py b/lib/getpositions.py
index b58af3a..1c5c50d 100644
--- a/lib/getpositions.py
+++ b/lib/getpositions.py
@@ -124,7 +124,7 @@ def get_subdistributor_positions(msp):
     # Alle Texte auf Layer "xy"
     for text in msp.query('MTEXT[layer=="Busverteiler-Kennzeichnung"]'):
         print(f"Text auf Layer 'Busverteiler-Kennzeichnung': {text.dxf.text}")
-        match = re.search(r"UC\w+", text.dxf.text)
+        match = re.search(r"=A\d\++\w+-\w\+", text.dxf.text)
         if match:
             nameUC =  match.group(0)
             ret[nameUC] = (round(text.dxf.insert[0],1), round(text.dxf.insert[1],1)) #nur x und y Koordinate in Json schreiben
@@ -208,6 +208,9 @@ if __name__ == '__main__':
             raise FileExistsError
     else:
         dxf_path = filename
+        if not os.path.exists(dxf_path):
+            print(f'no such file {dxf_path}')
+            raise FileExistsError
     doc = get_dxf_file(dxf_path) # type: ignore
     msp = doc.modelspace()