<script language="javascript">
function slash(val){
if(val.search(/\\\\/g) == -1)
alert("ok");
else
alert("sorry");
}
slash("aaa\\\\bb");
</script>
function slash(val){
if(val.search(/\\\\/g) == -1)
alert("ok");
else
alert("sorry");
}
slash("aaa\\\\bb");
</script>
var b="/s\s"
var c="/s\\s"
var reg=/\\/g
alert(!reg.test(a))
alert(!reg.test(b))
alert(!reg.test(c))