Converter Hex to RGB and RGB to Hex

this function for convert Hex to RGB

function hexToRgb() {

  // Get the value from input text

    var hex = document.getElementById("hex").value;

  // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF")
    var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
    hex = hex.replace(shorthandRegex, function(m, r, g, b) {
        return r + r + g + g + b + b;
    });
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    var rgb = "rgb("+parseInt(result[1], 16)+","+parseInt(result[2], 16)+","+parseInt(result[3], 16)+")";
  // Return value

    return rgb;
}

this function for convert RGB to Hex

function rgbToHex() {

  // Get value from input text
    var rgb = document.getElementById("rgb").value;

  // Remove all character and get the number
    rgb = rgb.replace(/[a-zA-Z()]+/g, "");

  // Split the string
    var res = rgb.split(",");

  // Get the individual value and set the hex
    var r = parseInt(res[0]).toString(16);
    var g = parseInt(res[1]).toString(16);
    var b = parseInt(res[2]).toString(16);

  // If result length == 1 add the 0 number
    r = r.length == 1 ? "0" + r : r;
    g = g.length == 1 ? "0" + g : g;
    b = b.length == 1 ? "0" + b : b;

  // Return value
    return "#"+r+g+b;
}

Result

See the Pen Converter Hex RGB by Hangs Breaker (@hangsbreaker) on CodePen.