关于js正则替换的问题

Question

将,,1,2,,3,,,4,a,,b,,,c,6,,3,,,,这种形式的字符串，替换为1,2,3,4,a,b,c,6,3,这个用js怎么替换啊。

Answer 1

var str = ',,1,2,,3,,,4,a,,b,,,c,6,,3,,,,';
str = str.replace(/^(,+)/, '').replace(/,+/g, ',');

Answer 2

var a=',,1,2,,3,,,4,a,,b,,,c,6,,3,,,,';
var b=a.match(/\w/g);
document.write(b);是这样？

Answer 3

<script type="text/javascript">
var a=",,1,2,,3,,,4,a,,b,,,c,6,,3,,,,";
var reg=/,{2,}/g;
var reg2=/^,+/
a=a.replace(reg,",").replace(reg2,"");
alert(a);
</script>
这样试试

Answer 4

<script type="text/javascript">
var str = ',,1,2,,3,,,4,a,,b,,,c,6,,3,,,,';
var re = /,+(?=,)/g;
alert( str.replace(re, '').replace(',', '') )
</script>

Answer 5

1、“,,1,2,,3,,,4,a,,b,,,c,6,,3,,,,” TO “1,2,3,4,a,b,c,6,3”：     alert(",,1,2,,3,,,4,a,,b,,,c,6,,3,,,,".replace(/^,+|,(?![^,])/g, ""))2、“,,1,2,,3,,,4,a,,b,,,c,6,,3,,,,” TO “1,2,3,4,a,b,c,6,3,”：     alert(",,1,2,,3,,,4,a,,b,,,c,6,,3,,,,".replace(/^,+|,(?![^,]|$)/g, ""))