Regex matching all the giving letter at any position one or multiple times

I’m trying to use a regex that matches all giving letter at any position one or multiple times, for example:

if user the input elol the result should be:

ollie Leola  cello  gello
hello   jello
lobel
lorel   losel
molle   oller

right now I have this:

.*elol

but it’s not working because it doesn’t match the letters in different positions in the words

the idea came from this site: https://www.wordhippo.com/what-is/word-finder-unscrambler.html (just search for words in the Containing the letters (in any position) input)

>Solution :

Use look aheads for each letter:

(?=\w*e)(?=\w*o)(?=(?:\w*l){2})\w+

See live demo.

Note that when a letter must appears multiple times, you must add an appropriate quantifier.