multirex

mrx.js

var text = "foobar";

text = text.replace(/o/g, "a");
text = text.replace(/a/g, "x");

document.write(text);


var text = "foobar";

var re1 = /o/g;
var re2 = /a/g;

text = text.replace(re1, "a");
text = text.replace(re2, "x");

document.write(text);

var text = "foobar";

var re1 = /o/;
var re2 = /a/;
var re = new RegExp(re1.source + "|" + re2.source, "g");

function repl(m) {
	if(m.match(re1)) {
    return m.replace(re1, "a")
  }
	if(m.match(re2)) {
    return m.replace(re2, "x")
  }
}

text = text.replace(re, repl);

document.write(text);