Please help me and ChatGPT to rewrite this Javascript Function

Hi

I have wasted several hours with ChatGPT trying to get a JavaScript Function to work. I would appreciate your help.

Note I am a "Copy and Paste" coder so have limited skills in fixing ChatGPT errors.

The function copied below correctly finds and formats matching pairs of words in boxes 2 to 5 that exist in box1
Box1 contains HTML Text
Boxes 2 to 5 contain one string per line enclised in <div>'s

eg
Following two strings are in box 1 and 2
"two words"
"this is four words"
(it correctly...

Please help me and ChatGPT to rewrite this Javascript Function WordPress ...