Javascript regex replace next match

Question

Many questions you might think are related will say something like "use /g". That's not what I'm after. There must be a way to do this. What I have is the following:

<script>
var myString = "DECLARE DeCLARE Declare DECLARE";
var arr = myString.match(new RegExp("[Dd]eclare|DECLARE","gm"));
var clr = "#F00";
for(var i=0; i<arr.length; i++)
{
    myString = myString.replace(arr[i],"-"+arr[i]+"-");
}
document.write(myString);
</script>

The output:

--DECLARE-- DeCLARE -Declare- DECLARE

Desired output:

-DECLARE- DeCLARE -Declare- -DECLARE-

user1106925 · Accepted Answer · 2013-05-02 01:45:29Z

1

Use a capturing group in the global regex, and use the captured value in the .replace().

var myString = "DECLARE DeCLARE Declare DECLARE";

// ---capture-----------v------------------v
var regex = new RegExp("([Dd]eclare|DECLARE)","gm");

// ---first capture------------------v
myString = myString.replace(regex,"-$1-");

document.write(myString); // "-DECLARE- DeCLARE -Declare- -DECLARE-"

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