Get RFC with regular expresion

source/sat/cfdi_openssl.py

@@ -2,6 +2,7 @@
 
 import base64
 import datetime
+import re
 from subprocess import check_output
 from dateutil.parser import parse
 from conf import TOKEN
@@ -58,13 +59,10 @@ class SATCertificate(object):
 
     def _get_data_cer(self, cer):
         # ~ RFC
-        sep = 'x500UniqueIdentifier = '
         cmd = f'{self.OPENSSL} x509 -inform der -in "{cer}" -noout -subject'
         result = check_output(cmd, shell=True).decode()
-        if not sep in result:
-            sep = 'x500UniqueIdentifier='
-        self._rfc = result.split(sep)[1].split(' /')[0]
-
+        pattern = r'[A-Z]{3,4}[0-9]{6}[A-Z0-9]{3}'
+        self._rfc = re.search(pattern, result)[0]
         # ~ Serial number
         sep = '='
         cmd = f'{self.OPENSSL} x509 -inform der -in "{cer}" -noout -serial'