myString = "javascript, 'JAVASCRIPT', JavaScript";
document.write(myString+"<br><br>");
myString=myString.replace(/javascript/ig, "---''$1''---");
document.write(myString);
myString.replace(/^.*\'([^\']*)\'.*$/, "---''$1''---")
myString = "javascript, 'JAVASCRIPT', JavaScript";
document.write(myString+"<br><br>");
myString=myString.replace(/javascript/ig, "---''$1''---");
document.write(myString);
myString.replace(/^.*\'([^\']*)\'.*$/, "---''$1''---")