返回正则表达式match（）在Javascript中的位置？

Question

有没有办法在Java的regex match（）结果的字符串中检索（开始）字符位置？

Answer 1

exec返回具有index属性的对象：

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

if (match) {

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

}

对于多个匹配项：

var re = /bar/g,

    str = "foobarfoobar";

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

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

}

Answer 2

这是我想出的：

// 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);

}