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<?php $text = <<< 'TXT' {ff0000}red tex {00ff00}green text TXT; echo preg_replace('~{([a-fA-F0-9]+)}((?>[^{]*{?(?!(?1)}))*)~', '<span style="color: #$1">$2</span>', $text);
Output for git.master, git.master_jit, rfc.property-hooks
<span style="color: #ff0000">red tex </span><span style="color: #00ff00">green text</span>

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