diff --git a/pytests/pattern_test.sh b/pytests/pattern_test.sh
index 25ca3a7..69ec26f 100755
--- a/pytests/pattern_test.sh
+++ b/pytests/pattern_test.sh
@@ -9,4 +9,4 @@ fi
 TEST_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 REPO_DIR="$TEST_DIR/.."
 
-pyang -p $OCDIR -p "$REPO_DIR/testdata" --plugindir "$REPO_DIR/pytests/plugins" --check-patterns "$REPO_DIR/testdata/regexp-test.yang"
+pyang -p $OCDIR -p "$REPO_DIR/testdata" --msg-template="line {line}: {msg}" --plugindir "$REPO_DIR/pytests/plugins" --check-patterns "$REPO_DIR/testdata/regexp-test.yang"
diff --git a/pytests/plugins/pattern_test.py b/pytests/plugins/pattern_test.py
index c9c7ee2..5cfc525 100644
--- a/pytests/plugins/pattern_test.py
+++ b/pytests/plugins/pattern_test.py
@@ -57,10 +57,10 @@ def setup_ctx(self, ctx):
         # Test case failure states.
         error.add_error_code(
             'VALID_PATTERN_DOES_NOT_MATCH', ErrorLevel.MAJOR,
-            'valid pattern "%s" does not match type "%s"')
+            'type "%s" rejected valid pattern: "%s"')
         error.add_error_code(
             'INVALID_PATTERN_MATCH', ErrorLevel.MAJOR,
-            'invalid pattern "%s" matches type "%s"')
+            'type "%s" accepted invalid pattern: "%s"')
 
         # Error states.
         error.add_error_code(
@@ -255,8 +255,8 @@ def check_patterns(ctx, mods):
                             break
                     else: # Exhausted all minterms.
                         err_add(ctx.errors, s.pos,
-                                'VALID_PATTERN_DOES_NOT_MATCH', (s.arg,
-                                                                 typestmt.arg))
+                                'VALID_PATTERN_DOES_NOT_MATCH', (typestmt.arg,
+                                                                 s.arg,))
                 elif is_statement_fail_testcase(s):
                     # Check that no minterm in the DNF is satisfied.
                     has_at_least_one_test = True
@@ -270,7 +270,7 @@ def check_patterns(ctx, mods):
                                 minterm_matches = False
                         if minterm_matches:
                             err_add(ctx.errors, s.pos, 'INVALID_PATTERN_MATCH',
-                                    (s.arg, typestmt.arg))
+                                    (typestmt.arg, s.arg))
                             break
 
             if not has_at_least_one_test:
diff --git a/pytests/tests/golden.txt b/pytests/tests/golden.txt
index 929f24a..27e9060 100644
--- a/pytests/tests/golden.txt
+++ b/pytests/tests/golden.txt
@@ -1,16 +1,16 @@
-testdata/python-plugin-test.yang:20: error: invalid pattern "ipv4" matches type "string"
-testdata/python-plugin-test.yang:21: error: valid pattern "ipv6" does not match type "string"
+testdata/python-plugin-test.yang:20: error: type "string" accepted invalid pattern: "ipv4"
+testdata/python-plugin-test.yang:21: error: type "string" rejected valid pattern: "ipv6"
 testdata/python-plugin-test.yang:23: error: leaf "ipv4-2" does not have any test cases
 testdata/python-plugin-test.yang:31: error: leaf "string" has unrestricted string type
 testdata/python-plugin-test.yang:34: error: leaf "union" has unrestricted string type
-testdata/python-plugin-test.yang:54: error: invalid pattern "ipv4" matches type "union"
-testdata/python-plugin-test.yang:55: error: valid pattern "ipv5" does not match type "union"
-testdata/python-plugin-test.yang:64: error: invalid pattern "ipv4" matches type "t:ip-string"
-testdata/python-plugin-test.yang:65: error: valid pattern "ipv5" does not match type "t:ip-string"
-testdata/python-plugin-test.yang:74: error: invalid pattern "ipv4" matches type "t:ip-string-typedef"
-testdata/python-plugin-test.yang:75: error: valid pattern "ipv5" does not match type "t:ip-string-typedef"
-testdata/python-plugin-test.yang:91: error: invalid pattern "ipv4" matches type "union"
-testdata/python-plugin-test.yang:92: error: valid pattern "hehe" does not match type "union"
-testdata/python-plugin-test.yang:93: error: invalid pattern "ipV5" matches type "union"
-testdata/python-plugin-test.yang:94: error: invalid pattern "ipv6" matches type "union"
-testdata/python-plugin-test.yang:104: error: valid pattern "ipv6" does not match type "t:ipv4-str"
+testdata/python-plugin-test.yang:54: error: type "union" accepted invalid pattern: "ipv4"
+testdata/python-plugin-test.yang:55: error: type "union" rejected valid pattern: "ipv5"
+testdata/python-plugin-test.yang:64: error: type "t:ip-string" accepted invalid pattern: "ipv4"
+testdata/python-plugin-test.yang:65: error: type "t:ip-string" rejected valid pattern: "ipv5"
+testdata/python-plugin-test.yang:74: error: type "t:ip-string-typedef" accepted invalid pattern: "ipv4"
+testdata/python-plugin-test.yang:75: error: type "t:ip-string-typedef" rejected valid pattern: "ipv5"
+testdata/python-plugin-test.yang:91: error: type "union" accepted invalid pattern: "ipv4"
+testdata/python-plugin-test.yang:92: error: type "union" rejected valid pattern: "hehe"
+testdata/python-plugin-test.yang:93: error: type "union" accepted invalid pattern: "ipV5"
+testdata/python-plugin-test.yang:94: error: type "union" accepted invalid pattern: "ipv6"
+testdata/python-plugin-test.yang:104: error: type "t:ipv4-str" rejected valid pattern: "ipv6"