how to take string after certain substring javascirpt code example

Example 1: javascript substring after character

// function you can use:
function getSecondPart(str) {
    return str.split('-')[1];
}
// use the function:
alert(getSecondPart("sometext-20202"));

Example 2: javascript substring after character

var testStr = "sometext-20202"
var splitStr = testStr.substring(testStr.indexOf('-') + 1);