CODE EXAMPLE FOR JAVASCRIPT

add site url validation regex

const regex = /^((ftp|http|https)://)?(www.)?(?!.*(ftp|http|https|www.))[a-zA-Z0-9_-]+(.[a-zA-Z]+)+((/)[w#]+)*(/w+?[a-zA-Z0-9_]+=w+(&[a-zA-Z0-9_]+=w+)*)?$/gm;
const str = `http://www.sample.com
https://www.sample.com
http://www.sample.com/xyz
www.sample.com
www.sample.com/xyz/#/xyz
sample.com
www.sample.com
mofiz.com
kolim.com
www.murikhao.www.sample.com
http://murihao.www.sample.com
http://www.sample.com/xyz?abc=dkd&p=q&c=2
www.sample.gov.bd
www.sample.com.en
www.sample.vu


`;
let m;

while ((m = regex.exec(str)) !== null) {

    if (m.index === regex.lastIndex) {
        regex.lastIndex++;
    }
    console.log("matched :"+m[0]);
}