Missing Letters using Regular Expressions?

JavaScript
#1

Tell us what’s happening:
My code worked and passed, so I don’t have a problem with that but I was wondering if it would be possible to solve this using regular expressions. eg something like
toMatch = /[^a-z]/

Just curious?

Your code so far


function fearNotLetter(str) {
for (var i=0; i<str.length; i++){
var code=str.charCodeAt(i);
if(code!==str.charCodeAt(0) + i){
  return String.fromCharCode(code-1);

}
}
return undefined;
}

fearNotLetter("abce");

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User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.113 Safari/537.36.

Challenge: Missing letters

Link to the challenge:

#2

I think we might need more of an explanation than just toMatch = /[^a-z]/ in order to answer your question. Would you give us more details about how you were thinking this could be solved?

#3

I see no regular expression in your code?
Why not try it and if it fails add it to this post :3

#4

Upon further discussion with my husband though of why you couldn’t use tomatch all the letters matching from a-z as if you weren’t given all the code from a-z it would likely return all the missing letters. Will investigate further as only new to this and if I can solve it in a different way might reply again.

#5