Find the start index (in string) of capture [JS/RegExp]

Is there anyway I can find the index (in string) of my RegExp capture? eg ...

var str = "hello开发者_如何学运维 world";
var regex = /lo (wo)/;
var match = regex.exec(str);
// what I want is something like 
var index = match[1].index; // where index = 6

indexOf() should give you what you want:

var index = str.indexOf(match[1]);

jsFiddle example

If you want to loop through each match, you need to add a g modifier to your regex, loop through it and call indexOf() each time. In your loop you pass a second argument to indexOf() to tell it where to start looking.

var str = "hello world hello world";
var regex = /lo (wo)/g;
var match;
var prevIndex, currIndex;
var indexes = [];

while (match = regex.exec(str)) {
    currIndex = str.indexOf(match[1], prevIndex);
    indexes.push(currIndex);
    prevIndex = regex.lastIndex;
}

jsFiddle example