jquery - How do I replace a specific part of a string in Javascript -

i have string looks

atom leu 0.1234 c 0.123 0.32 0.34 

how replace c .replace() & in javascript getting location of c? letter of c can anything.

i want

atom leu 0.1234 & 0.123 0.32 0.34. 

you can using substring(),

var str = "atom leu 0.1234 c 0.123 0.32 0.34"; var res = str.substring(0, 16) + "&" + str.substring(17); console.log(str); //"atom leu 0.1234 & 0.123 0.32 0.34"