What is a << Warning: Invalid preceding regular expression >> mean when
running a page?

Output -----------------------------------
Warning: Invalid preceding regular expression in /ereg.php on line 4

PHP Page Source -------------------------

function invalid_string($string,$valid) {
 for ($i=0; $i<strlen($string); $i++) {
  if (!ereg ($string[$i], $valid)) return true;                   \\Line
 return false;

if ($Action=="Submit") {
 $validChars =
"1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ";
 $validAlphas = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ";

 $validNums = "1234567890";
 if (invalid_string($Word,$validChars)) $Msg = "You entered a bad
 else $Msg = "That word is acceptable.";
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">


<body bgcolor="#FFFFFF" text="#000000">
<form name="form1" method="post" action="ereg.php">
  Please enter a valid word only. Only alphanumeric characters! I dare
you to
  try anything else.<br>
  <input type="text" name="Word" size="20" maxlength="20">
  <input type="submit" name="Action" value="Submit">

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