Replacing Characters On Condition

[megamanXplosion]

I have a message board (invision board) and I've edited the post_parser.php file to let someone use and to enter a javascript statement to execute (not show, execute). However....

The message board automatically inserts <br> in the place of line breaks, using this code....

$txt = preg_replace( "/<br>|<br\s*\/>/", "\n", $txt );

Is there anyway to make that conditional? As in, it'll replace line breaks with <br>, but if it's between and it won't?

[mordred]

That's not correct - the snippet above replaces <br> or <br /> tags with line breaks, so it works the other way round than you described.

Besides, you are aware of cross-site scripting attacks by letting your users execute javascript through your board?

[megamanXplosion]

sorry, I meant this line....

$txt = preg_replace( "/\n/", "<br>", $txt );

and is for the security issues, I am aware of them. I am going to be the only person on the message board capable of using javascript. I am wanting to post a bunch of tutorials for people and I need to be able to create examples along with the tutorials.


Thanks.

[megamanXplosion]

come up with anything?