JSFiddle - React, Tailwind, and code Playground
JavaScript
inpStr = "this is a string test with a lot of string words here another string string there string here string."
firstHalf = inpStr.split(/here(.+)?/)[0]
secondHalf = inpStr.split(/here(.+)?/)[1]
secondHalf = secondHalf.replace("string","anotherString")
resStr = firstHalf+"here"+secondHalf
alert(resStr)