var myStr = 'this,is,a,test';
var newStr = myStr.replace(/,/g, '-');
console.log( newStr ); // "this-is-a-test"var str = "JavaScript replace method test";
var res = str.replace("test", "success");
//res = Javscript replace method successvar res = str.replace("find", "replace");let text = "I love you"
text = text.replace( / +/g, '_') // replace with underscore ('_')
console.log(text) // I_love_you//Replace the first match in a string
//If you wish to replace all matches, use the replaceAll() method.
var str = "JavaScript replace method test";
var res = str.replace("test", "success");
//res = Javscript replace method successvar str = "Please locate where 'locate' occurs!";
str.replace("locate", "W3Schools"); //replace only replace first match from string
str.replace(/LOCATE/i, "W3Schools"); // i makes it case insensitive
str.replace(/LOCATE/g, "W3Schools"); // g replace all matches from string rather than replacing only first