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<?php $string = '#1Lorem Ipsum is simply dummy text#2printing and typesetting industry#0nothing#35That\'s a big one!'; echo preg_replace_callback( '/#(\d+)((?:(?!#\d).)+)/', fn($m) => sprintf( '<span class="%s">%s</span>', (new NumberFormatter("en", NumberFormatter::SPELLOUT))->format($m[1]), htmlentities($m[2]) ), $string );
Output for rfc.property-hooks, git.master, git.master_jit
<span class="one">Lorem Ipsum is simply dummy text</span><span class="two">printing and typesetting industry</span><span class="zero">nothing</span><span class="thirty-five">That&#039;s a big one!</span>

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