Removing line breaks from user input?

[Anon]

I made a script to insert text to database from a form's textfield.

How can remove extra line breaks. It should be ok to have one line break (which is converted into a <br />) and two line breaks (which are converted into a <p>).

Best and easiest way to do this?

[van__]

pattern match it.
$html = array('<br>+','<br>*');
$replace =array('<br/>','<p>');
$input = preg_replace($html,$replace,$input);

[Anon]

What is the regular expression to match both <ol> and </ol>?

I tried eregi("^<[*|/]ol>", $line) but it did not work for me...