diff --git a/README.md b/README.md
index 4d8a44ad..906bce47 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,7 @@ $matcher->getError(); // returns null or error message
 * ``startsWith($stringBeginning, $ignoreCase = false)``
 * ``endsWith($stringEnding, $ignoreCase = false)``
 * ``contains($string, $ignoreCase = false)``
+* ``notContains($string, $ignoreCase = false)``
 * ``isDateTime()``
 * ``isEmail()``
 * ``isUrl()``
diff --git a/src/Matcher/Pattern/Expander/NotContains.php b/src/Matcher/Pattern/Expander/NotContains.php
new file mode 100644
index 00000000..ccdb36b8
--- /dev/null
+++ b/src/Matcher/Pattern/Expander/NotContains.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Coduo\PHPMatcher\Matcher\Pattern\Expander;
+
+use Coduo\PHPMatcher\Matcher\Pattern\PatternExpander;
+use Coduo\ToString\StringConverter;
+
+final class NotContains implements PatternExpander
+{
+    const NAME = 'notContains';
+
+    private $error;
+
+    private $string;
+
+    private $ignoreCase;
+
+    public static function is(string $name) : bool
+    {
+        return self::NAME === $name;
+    }
+
+    public function __construct(string $string, $ignoreCase = false)
+    {
+        $this->string = $string;
+        $this->ignoreCase = $ignoreCase;
+    }
+
+    public function match($value) : bool
+    {
+        if (!\is_string($value)) {
+            $this->error = \sprintf('Not contains expander require "string", got "%s".', new StringConverter($value));
+            return false;
+        }
+
+        $contains = $this->ignoreCase
+            ? \mb_stripos($value, $this->string)
+            : \mb_strpos($value, $this->string);
+
+        if ($contains !== false) {
+            $this->error = \sprintf("String \"%s\" contains \"%s\".", $value, $this->string);
+
+            return false;
+        }
+
+        return true;
+    }
+
+    public function getError()
+    {
+        return $this->error;
+    }
+}
diff --git a/tests/Matcher/Pattern/Expander/ContainsTest.php b/tests/Matcher/Pattern/Expander/ContainsTest.php
index f0113751..6557c7d0 100644
--- a/tests/Matcher/Pattern/Expander/ContainsTest.php
+++ b/tests/Matcher/Pattern/Expander/ContainsTest.php
@@ -10,15 +10,15 @@
 class ContainsTest extends TestCase
 {
     /**
-     * @dataProvider examplesIgnoreCaseProvider
+     * @dataProvider examplesCaseSensitiveProvider
      */
-    public function test_matching_values_ignore_case($needle, $haystack, $expectedResult)
+    public function test_matching_values_case_sensitive($needle, $haystack, $expectedResult)
     {
         $expander = new Contains($needle);
         $this->assertEquals($expectedResult, $expander->match($haystack));
     }
 
-    public static function examplesIgnoreCaseProvider()
+    public static function examplesCaseSensitiveProvider()
     {
         return [
             ['ipsum', 'lorem ipsum', true],
@@ -29,15 +29,15 @@ public static function examplesIgnoreCaseProvider()
     }
 
     /**
-     * @dataProvider examplesProvider
+     * @dataProvider examplesCaseInsensitiveProvider
      */
-    public function test_matching_values($needle, $haystack, $expectedResult)
+    public function test_matching_values_case_insensitive($needle, $haystack, $expectedResult)
     {
         $expander = new Contains($needle, true);
         $this->assertEquals($expectedResult, $expander->match($haystack));
     }
 
-    public static function examplesProvider()
+    public static function examplesCaseInsensitiveProvider()
     {
         return [
             ['IpSum', 'lorem ipsum', true],
diff --git a/tests/Matcher/Pattern/Expander/NotContainsTest.php b/tests/Matcher/Pattern/Expander/NotContainsTest.php
new file mode 100644
index 00000000..1dfdfef4
--- /dev/null
+++ b/tests/Matcher/Pattern/Expander/NotContainsTest.php
@@ -0,0 +1,68 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Coduo\PHPMatcher\Tests\Matcher\Pattern\Expander;
+
+use Coduo\PHPMatcher\Matcher\Pattern\Expander\Contains;
+use Coduo\PHPMatcher\Matcher\Pattern\Expander\NotContains;
+use PHPUnit\Framework\TestCase;
+
+class NotContainsTest extends TestCase
+{
+    /**
+     * @dataProvider examplesCaseSensitiveProvider
+     */
+    public function test_matching_values_case_sensitive($needle, $haystack, $expectedResult)
+    {
+        $expander = new NotContains($needle);
+        $this->assertEquals($expectedResult, $expander->match($haystack));
+    }
+
+    public static function examplesCaseSensitiveProvider()
+    {
+        return [
+            ['ipsum', 'lorem ipsum', false],
+            ['wor', 'this is my hello world string', false],
+            ['lol', 'lorem ipsum', true],
+            ['NO', 'norbert', true]
+        ];
+    }
+
+    /**
+     * @dataProvider examplesCaseInsensitiveProvider
+     */
+    public function test_matching_values_case_insensitive($needle, $haystack, $expectedResult)
+    {
+        $expander = new NotContains($needle, true);
+        $this->assertEquals($expectedResult, $expander->match($haystack));
+    }
+
+    public static function examplesCaseInsensitiveProvider()
+    {
+        return [
+            ['IpSum', 'lorem ipsum', false],
+            ['wor', 'this is my hello WORLD string', false],
+            ['lol', 'LOREM ipsum', true],
+            ['NO', 'NORBERT', false]
+        ];
+    }
+
+    /**
+     * @dataProvider invalidCasesProvider
+     */
+    public function test_error_when_matching_fail($string, $value, $errorMessage)
+    {
+        $expander = new NotContains($string);
+        $this->assertFalse($expander->match($value));
+        $this->assertEquals($errorMessage, $expander->getError());
+    }
+
+    public static function invalidCasesProvider()
+    {
+        return [
+            ['ipsum', 'lorem ipsum', "String \"lorem ipsum\" contains \"ipsum\"."],
+            ['lorem', new \DateTime(), 'Not contains expander require "string", got "\\DateTime".'],
+        ];
+    }
+}