Remove duplicate characters from JS 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
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
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
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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