Understanding the Caret in regexp in JS

let str = '7hello'; 
let strRegex = /^[a-z]/;
let outcome = str.match(strRegex); 

When I run this in repl.it the output is null, but isn’t that wrong? I wanted to check to see if the beginning of the string had something other than a letter. I expected ‘7’.

in that way the caret is an anchor, it matches the start of a string

if you want to negate character class you need to put the caret inside the character class, like [^a-z]

if you want both (negate character class and math beginning of string) you need to use the caret in both places