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<script>
function check(obj){
if (obj.value.match(/^([0-9a-zA-Z]{2},){21}[0-9a-zA-Z]{2}$/
)) {
alert(obj.value+" is well formed!");
}
else{
alert(obj.value+" is not well formed!");
obj.value = "";
}
}
</script>
str.test(/(\w[^,]+(?=(,|$))).*?(\1(?=,)|\1$)/);
var str= "4j,cx,ub,nn,55,co";
var arr = str.split(/,/);