Regular Expression match in javascript

Try it like this:

var formula = 'SUM([A2:A10],[B2:B10],[C2:C10],[D2:D10])';
var reg = /\[\w+:\w+\]/g;
matches = formula.match(reg);

Output:

["[A2:A10]", "[B2:B10]", "[C2:C10]", "[D2:D10]"]

Your regex was in the right direction, but didn't include the colon and captured individual characters. The \w escape sequence I used is a shortcut for a word character ([a-zA-Z0-9_]), makes it more readable. The g flag is necessary to get all matches instead of just the first one.

var str = "SUM([A2:A10],[B2:B10],[C2:C10],[D2:D10])";

var matches = str.match(/\[[A-Z0-9:]+\]/g);
alert(matches);​

Note, you use the g flag on the regex to get all the matches.

You can see it working here: http://jsfiddle.net/jfriend00/aTrLU/

var formula = "SUM([A2:A10],[B2:B10],[C2:C10],[D2:D10])";
var reg = /\[.*?\]/g;
matches = formula.match(reg);