admin 管理员组

文章数量: 1086019

I have a string as follows :

var str = "a,b,c,a,e,f";

What I need is replace the last ma separated element by another.

ie, str = "a,b,c,a,e,anystring";

I have done it using split method and adding it to make a new string. But it is not working as expected

What I done as follows :

var str = "a,b,c,d,e,f";

var arr = str.split(',');

var res = str.replace(arr[5], "z");
alert(res);

Is there any regex to help?

I have a string as follows :

var str = "a,b,c,a,e,f";

What I need is replace the last ma separated element by another.

ie, str = "a,b,c,a,e,anystring";

I have done it using split method and adding it to make a new string. But it is not working as expected

What I done as follows :

var str = "a,b,c,d,e,f";

var arr = str.split(',');

var res = str.replace(arr[5], "z");
alert(res);

Is there any regex to help?

  • javascript
  • jquery
  • regex
Share Improve this question edited Nov 17, 2015 at 7:18 Pranav C Balan 115k25 gold badges171 silver badges195 bronze badges asked Nov 17, 2015 at 7:12 SanthucoolSanthucool 1,7262 gold badges39 silver badges92 bronze badges
Add a ment  | 

2 Answers 2

Reset to default 10

You can use replace() with regex /,[^,]+$/ to match the last string

var str = "a,b,c,d,e,old";
var res = str.replace(/,[^,]+$/, ",new");
// or you can just use
// var res = str.replace(/[^,]+$/, "new");
document.write(res);

Or you can just use regex str.replace(/[^,]+$/, "new");

var str = "a,b,c,d,e,old";
var res = str.replace(/[^,]+$/, "new");
document.write(res);

Or using split() , replace the last array value with new string and then join it again using join() method

var str = "a,b,c,d,e,old";
var arr = str.split(',');
arr[arr.length - 1] = 'new';
var res = arr.join(',');
document.write(res);

You could just use a String.substring() of String.lastIndexOf():

function replaceStartingAtLastComma(str, rep){
  return str.substring(0, (str.lastIndexOf(',')+1))+rep;
}
console.log(replaceStartingAtLastComma('a,b,c,d,e,f', 'Now this is f'));

本文标签： javascriptReplace last comma separated value by another using regexStack Overflow

版权声明：本文标题：javascript - Replace last comma separated value by another using regex - Stack Overflow 内容由网友自发贡献，该文观点仅代表作者本人， 转载请联系作者并注明出处：http://roclinux.cn/p/1744096377a2532973.html， 本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容，一经查实，本站将立刻删除。