diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
index 6cbe032..6d4446d 100644
--- a/system/libraries/Form_validation.php
+++ b/system/libraries/Form_validation.php
@@ -993,15 +993,19 @@
 	 * Minimum Length
 	 *
 	 * @param	string
-	 * @param	int
+	 * @param	string
 	 * @return	bool
 	 */
 	public function min_length($str, $val)
 	{
-		if (preg_match('/[^0-9]/', $val))
+		if ( ! is_numeric($val))
 		{
 			return FALSE;
 		}
+		else
+		{
+			$val = (int) $val;
+		}
 
 		return (MB_ENABLED === TRUE)
 			? ($val <= mb_strlen($str))
@@ -1014,15 +1018,19 @@
 	 * Max Length
 	 *
 	 * @param	string
-	 * @param	int
+	 * @param	string
 	 * @return	bool
 	 */
 	public function max_length($str, $val)
 	{
-		if (preg_match('/[^0-9]/', $val))
+		if ( ! is_numeric($val))
 		{
 			return FALSE;
 		}
+		else
+		{
+			$val = (int) $val;
+		}
 
 		return (MB_ENABLED === TRUE)
 			? ($val >= mb_strlen($str))
@@ -1035,15 +1043,19 @@
 	 * Exact Length
 	 *
 	 * @param	string
-	 * @param	int
+	 * @param	string
 	 * @return	bool
 	 */
 	public function exact_length($str, $val)
 	{
-		if (preg_match('/[^0-9]/', $val))
+		if ( ! is_numeric($val))
 		{
 			return FALSE;
 		}
+		else
+		{
+			$val = (int) $val;
+		}
 
 		return (MB_ENABLED === TRUE)
 			? (mb_strlen($str) === $val)