<?php $text = 'write {Hello, World!} in either the color {blue} or {red} or {#00AA00} and in either the font {Arial Black} or {Monaco} where both the color and the font are determined randomly'; var_export(preg_replace(['~{~', '~}~'], ['<strong>', '</strong'], preg_split('~({[^}]*}|\S+)\K ~', $text)));
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