diff --git a/verify.php b/verify.php
index 7e48fff..46ae271 100644
--- a/verify.php
+++ b/verify.php
@@ -220,6 +220,35 @@ class verify
     return true;
   }
 
+
+  /////////////////
+  //   STRINGS   //
+  /////////////////
+  /** Check if the provided value is only contains the provided chars.
+    * All the strings must be in UTF-8
+    * @param string $val The string to test
+    * @param string $allowedChars The allowed chars
+    */
+  public function isAllowedChars ($val, $allowedChars)
+  {
+    return \verify::staticIsAllowedChars ($val, $allowedChars);
+  }
+
+  /** Check if the provided value is only contains the provided chars.
+    * In static mode
+    * All the strings must be in UTF-8
+    * @param string $val The string to test
+    * @param string $allowedChars The allowed chars
+    */
+  public function staticIsAllowedChars ($val, $allowedChars)
+  {
+    preg_match ('/^['.$allowedChars.']+/u', $val, $matches);
+    if (isset ($matches[0]) &&
+        mb_strlen ($matches[0]) === mb_strlen ($val))
+      return true;
+    return false;
+  }
+
   /////////////////
   //   NUMBERS   //
   /////////////////