diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 471fcda..74fe91e 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -18,6 +18,7 @@ Yii Framework 2 Change Log
 - Bug #1631: Charset is now explicitly set to UTF-8 when serving JSON (samdark)
 - Bug #1635: `yii\jui\SliderInput` wasn't properly initialized (samdark)
 - Bug #1686: ActiveForm is creating duplicated messages in error summary (qiangxue)
+- Bug #1704: Incorrect regexp is used in `Inflector::camelize()` (qiangxue)
 - Bug: Fixed `Call to a member function registerAssetFiles() on a non-object` in case of wrong `sourcePath` for an asset bundle (samdark)
 - Bug: Fixed incorrect event name for `yii\jui\Spinner` (samdark)
 - Bug: Json::encode() did not handle objects that implement JsonSerializable interface correctly (cebe)
diff --git a/framework/yii/helpers/BaseInflector.php b/framework/yii/helpers/BaseInflector.php
index cb59986..f9f19a8 100644
--- a/framework/yii/helpers/BaseInflector.php
+++ b/framework/yii/helpers/BaseInflector.php
@@ -341,7 +341,7 @@ class BaseInflector
 	 */
 	public static function camelize($word)
 	{
-		return str_replace(' ', '', ucwords(preg_replace('/[^A-Z^a-z^0-9]+/', ' ', $word)));
+		return str_replace(' ', '', ucwords(preg_replace('/[^A-Za-z0-9]+/', ' ', $word)));
 	}
 
 	/**
diff --git a/tests/unit/framework/helpers/InflectorTest.php b/tests/unit/framework/helpers/InflectorTest.php
index e303ebd..ff414ba 100644
--- a/tests/unit/framework/helpers/InflectorTest.php
+++ b/tests/unit/framework/helpers/InflectorTest.php
@@ -73,6 +73,7 @@ class InflectorTest extends TestCase
 	public function testCamelize()
 	{
 		$this->assertEquals("MeMySelfAndI", Inflector::camelize('me my_self-andI'));
+		$this->assertEquals("QweQweEwq", Inflector::camelize('qwe qwe^ewq'));
 	}
 
 	public function testUnderscore()