diff --git a/application/forms.class.inc.php b/application/forms.class.inc.php
index d7c928698..f7379ac4c 100644
--- a/application/forms.class.inc.php
+++ b/application/forms.class.inc.php
@@ -937,8 +937,8 @@ EOF
 	public function ReadParam(&$aValues)
 	{
 		parent::ReadParam($aValues);
-
-		if (($this->sValidationPattern != '') &&(!preg_match('/'.$this->sValidationPattern.'/', $aValues[$this->sCode])) ) 
+		$sPattern = '/'.str_replace('/', '\/', $this->sValidationPattern).'/'; // Escape the forward slashes since they are used as delimiters for preg_match
+		if (($this->sValidationPattern != '') && (!preg_match($sPattern, $aValues[$this->sCode])) ) 
 		{
 			$aValues[$this->sCode] = $this->defaultValue;
 		}