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<script type="text/javascript">
var f = function() {
var str = "M100L200L300L400Z";
var ar = str.split(/[M,L,Z]/);
alert(ar.length);
}
</script>
<script type="text/javascript">
var f = function() {
var str = "M100L200L300L400Z";
if(!(!-[1,]))
{
var t=ar.join(',');
ar=t.slice(1,t.length-1).split(',');
}
alert(ar.length);
}
f();
</script>