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@ 2014-08-18T16:25:25Z

<?php
$string = 'ê[B]éîøoo[/B]åaí';

$isMatch = preg_match(
	'/\[(\w++)([=]?)([^\]]*?)\]([^\[]*?)\[\/\1\]|\[(HR|\*)\]/',
	$string,
	$matches
);

if($isMatch) {
	echo str_replace(
		"[{$matches[1]}]{$matches[4]}[/{$matches[1]}]",
		"<b>{$matches[4]}</b>",
		$string
	);
}

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)
str_replace: documentation ( source)

preferences:dark modelive preview

71.36 ms | 402 KiB | 5 Q