diff --git a/lib/json_schemer/schema/base.rb b/lib/json_schemer/schema/base.rb
index a947289c..ce5e5bca 100644
--- a/lib/json_schemer/schema/base.rb
+++ b/lib/json_schemer/schema/base.rb
@@ -416,7 +416,7 @@ def validate_string(instance, &block)
 
         yield error(instance, 'maxLength') if max_length && data.size > max_length
         yield error(instance, 'minLength') if min_length && data.size < min_length
-        yield error(instance, 'pattern') if pattern && resolve_regexp(pattern) !~ data
+        yield error(instance, 'pattern') if pattern && !resolve_regexp(pattern).match?(data)
         yield error(instance, 'format') if format? && spec_format?(format) && !valid_spec_format?(data, format)
 
         if content_encoding || content_media_type
diff --git a/test/json_schemer_test.rb b/test/json_schemer_test.rb
index ca370c8e..c497bed9 100644
--- a/test/json_schemer_test.rb
+++ b/test/json_schemer_test.rb
@@ -927,8 +927,8 @@ def initialize(pattern)
         self.class.counts += 1
       end
 
-      def !~(string)
-        @regexp !~ string
+      def match?(string)
+        @regexp.match?(string)
       end
     end