exec返回具有index屬性的對象：

var match = /bar/.exec("foobar");

if (match) {

    console.log("match found at " + match.index);

}

對于多個匹配項：

var re = /bar/g,

    str = "foobarfoobar";

while ((match = re.exec(str)) != null) {

    console.log("match found at " + match.index);

}

這是我想出的：

// Finds starting and ending positions of quoted text

// in double or single quotes with escape char support like \" \'

var str = "this is a \"quoted\" string as you can 'read'";

var patt = /'((?:\\.|[^'])*)'|"((?:\\.|[^"])*)"/igm;

while (match = patt.exec(str)) {

  console.log(match.index + ' ' + patt.lastIndex);

}