<script>
var str="55123123,5512,234234,65332,643434,523,532333,552322";
var arr=str.split(',');
for(var a in arr)
{
if(/^55\d+$/.test(arr[a]))
alert(arr[a].replace(/^55(\d+)/g,'88$1'));
}
</script>
var str="55123123,5512,234234,65332,643434,523,532333,552322";
var arr=str.split(',');
for(var a in arr)
{
if(/^55\d+$/.test(arr[a]))
alert(arr[a].replace(/^55(\d+)/g,'88$1'));
}
</script>
var str="55123123,5512,234234,65332,643434,523,532333,552322";
var arr=str.replace(/(^|,)55/g,"$188");
alert(arr);
</script>