使用正则实现字符去重及多行去重

单行文本单字符去重

function DistinctString(s){
var a;
while((a=s.replace(/(.)(.*?)\1/,"$1$2"))!=s) s=a;
return s;
}

多行文本去除重复行

function DistinctLines(s){
var a;
while((a=s.replace(/(^.+(?:\r\n|\r|\n|$))((?:.*(?:\r\n|\r|\n))*?)^\1(?:\r\n|\r|\n|$)/m,"$1$2"))!=s) s=a;
return s;
}

var a=[123,1234,9123,123,123,1234,321,123,9123,,1234];
DistinctLines(a.join("\n")).split("\n").filter(s=>s.length).map(s=>parseFloat(s));

//[123, 1234, 9123, 321]