get value between two characters javascript code example

Example 1: javascript get string between two characters

const oldString = 'John1Doe2'

const stringBetweenCharacters = oldString.match(/1(.*?)2/i)[1] //Doe

Example 2: javascript get text between two words

//Gets the part of the string inbetween the : and the ;
var part = str.substring(
    str.lastIndexOf(":") + 1, 
    str.lastIndexOf(";")
);