Fix host pattern matching and enhance error detection

Fixes #8614

lib/ansible/inventory/__init__.py

@@ -150,17 +150,24 @@ class Inventory(object):
 
 
     def _match(self, str, pattern_str):
+        try:
             if pattern_str.startswith('~'):
                 return re.search(pattern_str[1:], str)
             else:
                 return fnmatch.fnmatch(str, pattern_str)
+        except Exception, e:
+            raise errors.AnsibleError('invalid host pattern: %s' % pattern_str)
 
     def _match_list(self, items, item_attr, pattern_str):
         results = []
+        try:
             if not pattern_str.startswith('~'):
-            pattern = re.compile(fnmatch.translate(pattern_str))
+                pattern = re.compile('^' + fnmatch.translate(pattern_str))
             else:
                 pattern = re.compile(pattern_str[1:])
+        except Exception, e:
+            raise errors.AnsibleError('invalid host pattern: %s' % pattern_str)
+
         for item in items:
             if pattern.search(getattr(item, item_attr)):
                 results.append(item)