Regex Expression for word with certain unrepeated characters
<p>So I can't figure out how I would write a regex expression for finding words with certain letters in them that don't repeat.</p>

<p>So if lets say I want words with the letters "elolh"</p>

<p>Then these would match:
hello
hell
lol</p>

<p>But this wouldnt:
eel (because e repeats twice but there's only 1 e in my letters provided.</p>