I have a string in my JS that may contain the character (M and I need to find their position - but I can't work out how to without throwing an error I guess due to the bracket.
const findMTag = "(M"; //I need to search for this but it throws an error
let posMTag = nameJoined.search(findMTag);
console.log("TAG position = " + posMTag);
Try with indexOf
const findMTag = "(M"; //I need to search for this but it throws an error
let posMTag = nameJoined.indexOf(findMTag);
console.log("TAG position = " + posMTag);
String.search accepts a Regular expression as its argument, but you're passing a string to it, so it doesn't work. Take a look at String.search() for more info.
So your code will look like:
const findMTag = /\(M/;
const posMTag = nameJoined.search(findMTag);
console.log("TAG position = " + posMTag);