How to return part of string before a certain character?

Question

If you look at the jsfiddle from question,

var str = \"Abc: Lorem ipsum sit amet\";
str = str.substring(str.indexOf(\":\") + 1);

This retur

Answer 1

In General a function to return string after substring is

function getStringAfterSubstring(parentString, substring) {
    return parentString.substring(parentString.indexOf(substring) + substring.length)
}

function getStringBeforeSubstring(parentString, substring) {
    return parentString.substring(0, parentString.indexOf(substring))
}
console.log(getStringAfterSubstring('abcxyz123uvw', '123'))
console.log(getStringBeforeSubstring('abcxyz123uvw', '123'))