Why doesn't this work????

This works well, but only if [IMG] is UPPER-CASE,

$text = "[IMG]goldeneye.gnw.de/images/LOL.gif[IMG]";
$text = ereg_replace("[IMG]([^{[IMG]*)[IMG]",} "<img src=\"http://\1\">", $text);
echo $text;

but it should work in lower-case,too, so I added an i in the ereg_replace command. But now it doesn't replace

$text = "[img]goldeneye.gnw.de/images/LOL.gif[img]";
$text = eregi_replace("[IMG]([^{[IMG]*)[IMG]",} "<img src=\"http://\1\">", $text);
echo $text;

RESULT:
[img]goldeneye.gnw.de/images/LOL.gif[img]

What is the IMG in ([^[IMG]*) for?

try this:
$text = "[img]goldeneye.gnw.de/images/LOL.gif[img]";
$text = eregi_replace("[IMG](.*)[IMG]", "<img src=\"http://\1\">", $text);

What about using a strtoupper($text) and when finished then using a strtolower($text)?

Thx, works fine 🙂

That might work, but in the end it would always convert the string to lowercase, and that is an unwanted side-effect.