regexp tutorial?

[Anon]

Do you know if there is somewhere on the web a good tutorial about regular expressions for eregi-function?

I'm trying to add <p> to the beginning of string if there is no <h1> or </h1> tag present. My function does not work, if string begins with </h1>:

if (!eregi("^{[<|</]h[0-6]>",} $string)) {
$string.="<p>".$string;
}

Again, what is wrong?

[van__]

I've seen a few in the past, but don't have any book'd.

I do think your class is messed though ... "[<|</]" looks all wrong.
Each character should only be specified once in a class.

Also use preg over ereg, the POSIX extensions really slow ereg down.

<?

if (preg_match('/^{[<\/]{1,2}H+[1-5]+>+/i',$string)} {
$string .= '<p>';
}

?>
...should work

[van__]

Here's a 1 liner version using perg_replace().

<?
$string = "</h1>testing testing testing";
$string = preg_replace('/^{([<\/]{1,2}H+[1-5]+>+)/i',"<p>\1",$string);}
echo $string;
?>