RegExp problem

I am just a little guru and found Photoshop RegEx implementation is very lame. It was sometimes corrected with another releases, but generally it has own broken rules. I also had some problem with 'search', maybe it's related to your problem:

RegExp search bug - PS-SCRIPTS.COM

The great thing about regex is that there are many valid answers to the same problem. This is just what I came up with first. I like capture groups and back references, there will of course be other ways to the same answer.

So if the pattern is to return the first digit at the beginning of the string, then skip 2 digits, skip 3 alphas, return the next digit, then skip everything else thereafter...

var s = "123abc123aac"  
alert(s.replace(/(^\d)(?:\d{2}\D+)(\d)(?:.+)/,"$1$2"));