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<script>
var r1=/^(\d+\|)*\d+$/;
var r2=/((^|\|)(\d+)(\|\d+)*?)\|\3(\||$)/;
var s = "1|2|3|31|5"
alert(r1.test(s) && !r2.test(s))
</script>
// 重新来一个吧, 虽然还长了,不过平均性能还不错
/^(?!.*\b(\d+)\b.*\|\1\b)\d+(?:\|\d+)*$/.test(s)
alert("a1s2d3f4".replace(/(\w)\d/g, "$1"));
/^((\d+)(?!.*\|\2\b)\|)*\d+$/
document.close();
document.open();
var r1=/^(\d+\|)*\d+$/;
var r2=/((^|\|)(\d+)(\|\d+)*?)\|\3(\||$)/;
var r3=/[^\d^\|]|^\||\|$|\|\||((^|\|)(\d+)(\|\d+)*?)\|\3(\||$)/
var data = ["1", "1|", "|2", "1||2", "1|2", "2|2|3", "1|2|3|31|5", "1|2|3|31|3|5", "1|2|331|5", "2|1|3|31|5|1"];
for(var i = 0; i < data.length; i++) {
var s = data[i];
document.write(s);
document.write("=");
document.write(r1.test(s) && !r2.test(s));
document.write(",");
document.write(!r3.test(s));
document.write("<br/>");
}
1=true,true
1|=false,false
|2=false,false
1||2=false,false
1|2=true,true
2|2|3=false,false
1|2|3|31|5=true,true
1|2|3|31|3|5=false,false
1|2|331|5=true,true
2|1|3|31|5|1=false,false
/^(?!.*(\d+)\b.*\|\1\b)\d+(?:\|\d+)*$/.test(s)
<script>
document.close();
document.open();
var r1=/^(\d+\|)*\d+$/;
var r2=/((^|\|)(\d+)(\|\d+)*?)\|\3(\||$)/;
var r3=/^(?:(\d+)(?!.*\|\1\b)\|)*\d+$/;
var data = ["1", "1|", "|2", "1||2", "1|2", "2|2|3", "1|2|3|31|5", "1|2|3|31|3|5", "1|2|331|5", "2|1|3|31|5|1"];
for(var i = 0; i < data.length; i++) {
var s = data[i];
document.write(s);
document.write("=");
document.write(r1.test(s) && !r2.test(s));
document.write(",");
document.write(r3.test(s));
document.write("<br/>");
}
</script>
var r3=/^(?:(\d+)(?!.*\|\1\b)\|)*\d+$/;
document.write(r3.test(s));