diff --git a/lam/lib/account.inc b/lam/lib/account.inc
index 93b6ba02..65ac7a11 100644
--- a/lam/lib/account.inc
+++ b/lam/lib/account.inc
@@ -57,10 +57,10 @@ function getshells() {
 * In order to map all non-ascii characters this function should be changed
 */
 function replace_umlaut($text) {
-	$aTranslate = array("ä"=>"ae", "Ä"=>"Ae",
-		"ö"=>"oe", "Ö"=>"Oe",
-		"ü"=>"ue", "Ü"=>"Ue",
-		"ß"=>"ss"
+	$aTranslate = array("�"=>"ae", "�"=>"Ae",
+		"�"=>"oe", "�"=>"Oe",
+		"�"=>"ue", "�"=>"Ue",
+		"�"=>"ss"
 		);
 	return strtr($text, $aTranslate);
 	}
@@ -416,4 +416,44 @@ class samba3domain {
 	var $RIDbase = 1000;
 }
 
+/** This functions contains a collection of regular expressions
+* It's much easier to handle them here than in every module
+* because many of them are used several times.
+**/
+function get_ereg($argument, $regexp) {
+	// First we check "positive" cases
+	$eregexpr = '';
+	switch ($regexp) {
+		case "password":      $eregexpr = '^([a-z]|[A-Z]|[0-9]|[\|]|[\#]|[\*]|[\,]|[\.]|[\;]|[\:]|[\_]|[\-]|[\+]|[\!]|[\%]|[\&]|[\/]|[\?]|[\{]|[\[]|[\(]|[\)]|[\]]|[\}])*$'; break;
+		case "username":      $eregexpr = '^([a-z]|[A-Z]|[0-9]|[.]|[ ]|[-]|[_])+$'; break;
+		case "hostname":      $eregexpr = '^([a-z0-9\\.-])+(([,])+([ ])*([a-z0-9\\.-])+)*$'; break;
+		case "realname":      $eregexpr = ''; break;
+		case "telephone":     $eregexpr = '^(\+)*([0-9]|[ ]|[.]|[(]|[)]|[/]|[-])*$'; break;
+		case "email":         $eregexpr = '^(([0-9a-z\\._-])+[@]([0-9a-z-])+([.]([0-9a-z-])+)*)*$'; break;
+		case "street":        $eregexpr = '^([0-9a-z])*$'; break; // ereg broken
+		case "postalAddress": $eregexpr = '^([0-9a-z])*$'; break; // ereg broken
+		case "postalCode":    $eregexpr = '^([0-9a-z])*$'; break;
+		case "title":         $eregexpr = '^([0-9a-z])*$'; break; // ereg broken
+		case "employeeType":  $eregexpr = '^([0-9a-z])*$'; break; // ereg broken
+		case "homedir":       $eregexpr = '^[/]([a-z])([a-z0-9\\._-])*([/]([a-z\\$])([a-z0-9\\._-])*)*$'; break;
+		case "naturalnumber": $eregexpr = '^[0-9]+$'; break;
+		case "UNC":           $eregexpr = '^([\][\]([a-zA-Z0-9\\.%-])+([\]([a-z0-9\\.%-])+)+)|([/][a-z]([a-z0-9\\._%-])*([/][a-z]([a-z0-9\\._%-])*)*)$'; break;
+		case "logonscript":   $eregexpr = '^([/])*([a-z0-9])+([/]([a-z0-9])+)*((\\.bat)|(\\.cmd))$'; break;  // ereg broken
+		case "workstations":  $eregexpr = '^([a-z0-9\\._-])+(,[a-z0-9\\._-])*$'; break;
+		case "domainname":    $eregexpr = '^([a-z0-9_-])+$'; break;
+		case 'homepath':      $eregexpr = '[\][\]([a-z]|[A-Z]|[0-9]|[.]|[-]|[%])+([\]([a-z]|[A-Z]|[0-9]|[.]|[-]|[%]|[?]|[?]|[?]|[?]|[?]|[?]|[?])+)+$'; break;
+		case 'naturalnumber2': $eregexpr = '^(([-][1])|([0-9]*))$'; break;
+	}
+	if ($eregexpr!='')
+		if (ereg($eregexpr, $argument)) return true;
+	// Now we check "negative" cases, characters which are not allowed
+	$eregexpr = '';
+	switch ($regexp) {
+		case "password":      $eregexpr = '^([a-z]|[A-Z]|[0-9]|[\|]|[\#]|[\*]|[\,]|[\.]|[\;]|[\:]|[\_]|[\-]|[\+]|[\!]|[\%]|[\&]|[\/]|[\?]|[\{]|[\[]|[\(]|[\)]|[\]]|[\}])*$'; break;
+	}
+	if ($eregexpr!='')
+		if (!ereg($eregexpr, $argument)) return true;
+	return false;
+}
+
 ?>
diff --git a/lam/lib/modules/posixGroup.inc b/lam/lib/modules/posixGroup.inc
index 54e48485..4d839435 100644
--- a/lam/lib/modules/posixGroup.inc
+++ b/lam/lib/modules/posixGroup.inc
@@ -347,10 +347,9 @@ class posixGroup extends baseModule {
 	/** this functin fills the error message array with messages
 	**/
 	function load_errorMessages() {
-		// *** fixme really neccesarry for posixGroup?
-		//$this->errormessages['minGID'][0] = array('ERROR', _('Minimum GID number'), _('Minimum GID number is invalid or empty!'));
-		//$this->errormessages['maxGID'][0] = array('ERROR', _('Maximum GID number'), _('Maximum GID number is invalid or empty!'));
-		//$this->errormessages['cmpGID'][1] = array('ERROR', _('Maximum GID number'), _('Maximum GID number must be greater than minimum GID number!'));
+		$this->errormessages['minGID'][0] = array('ERROR', _('Minimum GID number'), _('Minimum GID number is invalid or empty!'));
+		$this->errormessages['maxGID'][0] = array('ERROR', _('Maximum GID number'), _('Maximum GID number is invalid or empty!'));
+		$this->errormessages['cmpGID'][0] = array('ERROR', _('Maximum GID number'), _('Maximum GID number must be greater than minimum GID number!'));
 		$this->errormessages['userPassword'][0] = array('ERROR', _('Password'), _('Please enter the same password in both password-fields.'));
 		$this->errormessages['userPassword'][1] = array('ERROR', _('Password'), _('Password contains invalid characters. Valid characters are: a-z, A-Z, 0-9 and #*,.;:_-+!$%&/|?{[()]}= !'));
 		$this->errormessages['gidNumber'][0] = array('INFO', _('GID number'), _('GID number has changed. Please select checkbox to change GID number of users and hosts.'));
@@ -474,7 +473,7 @@ class posixGroup extends baseModule {
 				if (($this->attributes['cn'][0] != $post['cn']) &&  ereg('[A-Z]$', $post['cn']))
 				$errors['cn'][] = $this->errormessages['cn'][0];
 				// Check if Groupname contains only valid characters
-				if ( !ereg('^([a-z]|[A-Z]|[0-9]|[.]|[-]|[_])+$', $this->attributes['cn'][0]))
+				if ( !ereg('^([a-z]|[A-Z]|[0-9]|[.]|[ ]|[-]|[_])+$', $this->attributes['cn'][0]))
 				$errors['cn'][] = $this->errormessages['cn'][2];
 				// Create automatic useraccount with number if original user already exists
 				// Reset name to original name if new name is in use