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<?php $re = '~(?:<p>(?=[^<>]*</p>)|\G(?!^))[^\d<>]*\d+\K\h~'; $str = '<p>My 90 days 123 work.</p>'; echo preg_replace($re, "&nbsp", $str);
Output for git.master, git.master_jit, rfc.property-hooks
<p>My 90&nbspdays 123&nbspwork.</p>

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