If I have a string which looks like this:
var myString = '73gf9y::-8auhTHIS_IS_WHAT_I_WANT'
What regex would I need to end up with:
'THIS_IS_WHAT_I_WANT'
The first part of my String will always be a random assortment of characters. Is there some regex which will remove everything up to THIS?
So you want to strip out everything from beginning to the first uppercase letter?
console.log(myString.replace(/^[^A-Z]+/,""));
THIS_IS_WHAT_I_WANT
See fiddle, well I'm not sure if that is what you want :)
To strip out everything from start to the first occuring uppercase string, that's followed by _ try:
myString.replace(/^.*?(?=[A-Z]+_)/,"");
This uses a lookahead. See Test at regex101;
Going by the input, you can use match. The character class [A-Z_] matches any capital letters and _ (Underscore) and + quantifier along with $ anchor matches the character class till the end of the string.
myString = myString.match(/[A-Z_]+$/)[0];
console.log(myString); // THIS_IS_WHAT_I_WANT
Adding to Amit Joki's excellent solution (sorry I don't have the rep yet to comment): since match returns an array of results, if you need to remove unwanted characters from within the string, you can use join:
input = '(800) 555-1212';
result = input.match(/[0-9]+/g).join('');
console.log(result); // '8005551212'
