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var s = "001002003"
var re = new RegExp(".{3}","g")
var a = []
while ((n=re.exec(s)) != null){
a[a.length] = n[0]
}
for(i in a) alert(a[i])
<script>
var s="00100200343";
alert(s.match(/\d{3}|\d+$/g));
</script>
var s = "00100200343"
var reg=/\d{3}|\d{2}|\d{1}/g;
alert(s.match(reg))
var s = "001002003"
var reg=/\d{3}/g;
alert(s.match(reg))