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Remove duplicate characters from JS string

Mar 29, 2018 am 09:21 AM
javascript character string

这次给大家带来JS字符串剔除重复字符,JS字符串剔除重复字符的注意事项有哪些,下面就是实战案例,一起来看一下。

()和\number 配合使用表示重复正则第number个括号内匹配到的内容,如:(\d)\1表示重复第一个匹配块(\d)即等价于如果(\d)匹配到a,则表达式为aa

相应的可以:(some)\1* 或(some)\1+或(some)\1? 表示重复第一个匹配快得到的内容 任意次或者 至少一次或 一次or零次

  var s = "1122333455";
     var s1 = s;
     var c;
     var cc = s.match(/(\d)\1+/g);    //11,22,333,55 当然这里用()\1*也会可以(因为下面是替换):11,22,333,4,55
     for(var i = 0;i<cc.length;i++){
         c = cc[i].substring(0,1);
         s1 = s1.replace(cc[i],c);
    }
    alert(s1);   //12345
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js字符串去除全部重复字符,并把最终字符串排序

     var s = "1234321abaccc";
     var s1 = s.split("").sort().join("");
     var cc = s1.match(/(.)\1+/g);    //11,22,33,aa,ccc 当然这里用()\1*也会可以(因为下面是替换):11,22,33,4,aa,b,ccc
     for(var i = 0;i<cc.length;i++){
         c = cc[i].substring(0,1);
         s1 = s1.replace(cc[i],c);
     }
    alert(s1);    //1234abc
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 PS:下面看下js重复某个字符串n次 | 字符串转数组

 js重复某个字符串n次

function repeat(str , n){
return new Array(n+1).join(str);
}
console:
repeat("a", 3); //aaa
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 字符串转数组

var sa="ABCD";
var newStr=Array.prototype.join.call(sa); //A,B,C,D
newStr.split(','); //['A','B','C','D']
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