[enh] #170: Define more compact ipv4 regex

composed out of common part

duniterpy/constants.py

@@ -28,10 +28,9 @@ CONDITIONS_REGEX = (
         pubkey_regex=PUBKEY_REGEX, hash_regex=HASH_REGEX
     )
 )
-IPV4_REGEX = (
-    "(?:(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4]["
-    "0-9]|25[0-5])"
-)
+# https://stackoverflow.com/a/17871737
+IPV4SEG = "(?:25[0-5]|(?:2[0-4]|1?\\d)?\\d)"
+IPV4_REGEX = f"(?:{IPV4SEG}\\.){{3}}{IPV4SEG}"
 IPV6_REGEX = (
     "(?:(?:[0-9A-Fa-f]{1,4}:){6}(?:[0-9A-Fa-f]{1,4}:[0-9A-Fa-f]{1,4}|(?:(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2["
     "0-4][0-9]|25[0-5])\\.){3}(?:[0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))|::(?:[0-9A-Fa-f]{1,"