diff --git a/plugins/module_utils/common/conversion.py b/plugins/module_utils/common/conversion.py
index e58d497e8..a8c94078c 100644
--- a/plugins/module_utils/common/conversion.py
+++ b/plugins/module_utils/common/conversion.py
@@ -32,29 +32,7 @@ class ConversionUtils:
     """
 
     def __init__(self):
-        re_asn_string = "^(("
-        re_asn_string += "(\\+)?[1-9]{1}[0-9]{0,8}|"
-        re_asn_string += "(\\+)?[1-3]{1}[0-9]{1,9}|"
-        re_asn_string += "(\\+)?"
-        re_asn_string += "[4]{1}([0-1]{1}[0-9]{8}|"
-        re_asn_string += "[2]{1}([0-8]{1}[0-9]{7}|"
-        re_asn_string += "[9]{1}([0-3]{1}[0-9]{6}|"
-        re_asn_string += "[4]{1}([0-8]{1}[0-9]{5}|"
-        re_asn_string += "[9]{1}([0-5]{1}[0-9]{4}|"
-        re_asn_string += "[6]{1}([0-6]{1}[0-9]{3}|"
-        re_asn_string += "[7]{1}([0-1]{1}[0-9]{2}|"
-        re_asn_string += "[2]{1}([0-8]{1}[0-9]{1}|"
-        re_asn_string += "[9]{1}[0-5]{1})))))))))|"
-        re_asn_string += "([1-5]\\d{4}|"
-        re_asn_string += "[1-9]\\d{0,3}|"
-        re_asn_string += "6[0-4]\\d{3}|"
-        re_asn_string += "65[0-4]\\d{2}|"
-        re_asn_string += "655[0-2]\\d|"
-        re_asn_string += "6553[0-5])(\\.[1-5]\\d{4}|[1-9]\\d{0,3}|"
-        re_asn_string += "6[0-4]\\d{3}|65[0-4]\\d{2}|"
-        re_asn_string += "655[0-2]\\d|6553[0-5]|0)?)$"
-        self.re_asn = re.compile(re_asn_string)
-
+        self.re_asn = re.compile("^(((\\+)?[1-9]{1}[0-9]{0,8}|(\\+)?[1-3]{1}[0-9]{1,9}|(\\+)?[4]{1}([0-1]{1}[0-9]{8}|[2]{1}([0-8]{1}[0-9]{7}|[9]{1}([0-3]{1}[0-9]{6}|[4]{1}([0-8]{1}[0-9]{5}|[9]{1}([0-5]{1}[0-9]{4}|[6]{1}([0-6]{1}[0-9]{3}|[7]{1}([0-1]{1}[0-9]{2}|[2]{1}([0-8]{1}[0-9]{1}|[9]{1}[0-5]{1})))))))))|([1-5]\\d{4}|[1-9]\\d{0,3}|6[0-4]\\d{3}|65[0-4]\\d{2}|655[0-2]\\d|6553[0-5])(\\.([1-5]\\d{4}|[1-9]\\d{0,3}|6[0-4]\\d{3}|65[0-4]\\d{2}|655[0-2]\\d|6553[0-5]|0))?)$")
         self.bgp_as_invalid_reason = None
 
     def bgp_as_is_valid(self, value):