preg_match() [function.preg-match]: Compilation failed ?

Bonjour, je débute totalement en php:

Ma page me renvoit cette erreur :

Citation:

Warning: preg_match() [function.preg-match]: Compilation failed: range out of order in character class at offset 12 in /home/tc81/public_html/mktgsi/contact/index.php on line 60
false

Et voici mon code actuel :

Code:

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<?php
function is_valid_email($mail)
	{
      if(preg_match("/[a-zA-Z0-9_-.+]+@[a-zA-Z0-9-]+.[a-zA-Z]+/", $mail) > 0)
	  	{
      		return true;
	  	}
      else
	  	{
      		return false;
	  	}
    }
 
$to = "---@---.---";
$subject = $_REQUEST['title'] ;
$email = $_REQUEST['email'] ;
$message = $_REQUEST['message'] ;
$headers = "From: $email";
 
$send = is_valid_email($email);
If ($send)
{echo "true";}
else
{echo "false";}
 
if (!$email=="")
	{
		$sent = mail($to, $subject, $message, $headers) ;
		if($sent)
			{echo "<script>alert('your mail was sent successfully')</script>";} 
		else
			{print "We encountered an error sending your mail";}	
	}
 
?>