How to remove consecutive and repeated characters from JS string-JS Tutorial-php.cn

How to remove consecutive and repeated characters from JS string

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Release： 2018-03-12 09:26:22

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本文主要和大家分享JS字符串去除连续及重复字符方法，希望能帮助到大家。

()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(&#39;,&#39;); //[&#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;]

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