Phantom wrote: > What is a << Warning: Invalid preceding regular expression >> mean when > running a page?
Some characters have special meaning in regex, and some combinations are simply invalid. You are iterating through one character at a time, and passing in such a "combination" to regex. Most importantly, you are pretty much doing it wrong. :-) What you *SHOULD* be using is something more like this: $validChars = '[^0-9A-Za-z]'; function invalid_string($string, $valid){ return ereg_replace($valid, '', $string); } And, actually, since your function is now a single line, you might as well not bother having a function, eh?... For sure, you should *NOT* be using a for loop to check each character one at a time. > > Output ----------------------------------- > Warning: Invalid preceding regular expression in /ereg.php on line 4 > > PHP Page Source ------------------------- > > <% > function invalid_string($string,$valid) { > for ($i=0; $i<strlen($string); $i++) { > if (!ereg ($string[$i], $valid)) return true; \\Line > 4; > } > return false; > } > > if ($Action=="Submit") { > $validChars = > "1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ "; > $validAlphas = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ "; > > $validNums = "1234567890"; > if (invalid_string($Word,$validChars)) $Msg = "You entered a bad > word."; > else $Msg = "That word is acceptable."; > } > %> > <html> > <head> > <title>Ereg</title> > <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> > > </head> > > <body bgcolor="#FFFFFF" text="#000000"> > <%=$Msg;%><title>EREG</title> > <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"> > </form> > </body> > </html> > > > > -- Like music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]