Require complete BTC and ETH address matches

src/validators/crypto_addresses/btc_address.py

@@ -50,7 +50,7 @@ def btc_address(value: str, /):
 
     return (
         # segwit pattern
-        re.compile(r"^(bc|tb)[0-3][02-9ac-hj-np-z]{14,74}$").match(value)
+        re.compile(r"^(bc|tb)[0-3][02-9ac-hj-np-z]{14,74}$").fullmatch(value)
         if value[:2] in ("bc", "tb")
         else _validate_old_btc_address(value)
     )

src/validators/crypto_addresses/eth_address.py

@@ -59,6 +59,6 @@ def eth_address(value: str, /):
     if not value:
         return False
 
-    return re.compile(r"^0x[0-9a-f]{40}$|^0x[0-9A-F]{40}$").match(
+    return re.compile(r"^0x[0-9a-f]{40}$|^0x[0-9A-F]{40}$").fullmatch(
         value
     ) or _validate_eth_checksum_address(value)

tests/crypto_addresses/test_complete_addresses.py

@@ -0,0 +1,25 @@
+"""Require complete BTC and ETH addresses."""
+
+from typing import Callable
+
+import pytest
+
+from validators import ValidationError, btc_address, eth_address
+
+
+@pytest.mark.parametrize(
+    "validate,value",
+    [
+        (btc_address, "bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq"),
+        (btc_address, "tb1qw508d6qejxtdg4y5r3zarvary0c5xw7kxpjzsx"),
+        (eth_address, "0x9cc14ba4f9f68ca159ea4ebf2c292a808aaeb598"),
+        (eth_address, "0x9CC14BA4F9F68CA159EA4EBF2C292A808AAEB598"),
+    ],
+)
+@pytest.mark.parametrize("suffix", ["", "\n", "\r\n", " ", "\nextra"])
+def test_complete_address(validate: Callable[[str], object], value: str, suffix: str):
+    """Accept the address alone and reject trailing characters."""
+    if suffix:
+        assert isinstance(validate(value + suffix), ValidationError)
+    else:
+        assert validate(value) is True