JavaScript：如何获取紧跟在另一个特定字符之后的某个字符出现的索引？答案

【问题标题】：JavaScript: How to get index of the occurrence of a certain character that is immediately after another certain character?JavaScript：如何获取紧跟在另一个特定字符之后的某个字符出现的索引？
【发布时间】：2017-02-11 07:11:02
【问题描述】：

假设我有一系列推文：

var arr = ['@userone Hey man, whats popping', 'Shoutout to @usertwo haha']

我将如何摆脱提及并仅包含消息？比如：

var newArr = ['Hey man, whats popping', 'Shoutout to haha']

这是我能想到的

if (tweet.includes('@')) {
  var atIndex = tweet.indexOf('@');
  var spaceIndex = // index of the nearest space after @
  var strToReplace = tweet.substring(atIndex, spaceIndex);
  tweet = tweet.replace(strToReplace, '');

}

请帮忙。

【问题讨论】：

Javascript / REGEX: Delete a specific Text (word) starting with a specific letter inside a String with words separated by spaces的可能重复

标签： javascript

【解决方案1】：

Regex 是你的朋友。

   var arr = ['@userone Hey man, whats popping', 'Shoutout to @usertwo haha'];

    arr.forEach(function(element,index) {
        arr[index] = element.replace(/@[A-Za-z0-9]*\s/, "");
    }

    console.log(arr);

【讨论】：

【解决方案2】：

arr.map(e => e.replace(/(?:^|\W)@(\w+)(?!\w)/g,"") )

一行完成:) ...演示是here

【讨论】：

【解决方案3】：

以@Abdennour 为基础...

var newArr = arr.map(e => e.replace(/@\w+\s+/,"") );

【讨论】：

【解决方案4】：

var arr = ['@userone Hey man, whats popping', 
           'Shoutout to @usertwo haha'
          ];
var i = 0, at_pos, sp_pos, str_rep;
while(i<arr.length) {
  at_pos  = arr[i].indexOf('@');
  sp_pos  = arr[i].indexOf(' ', at_pos);
  str_rep = arr[i].substring(at_pos, sp_pos+1);
  arr[i]  = arr[i].replace(str_rep, '');
  console.log(arr[i]);
  i++;
}

或者你可以使用正则表达式，比如

var arr = ['@userone Hey man, whats popping', 
           'Shoutout to @usertwo haha'
          ];
var i=0;
while(i<arr.length){
  arr[i] = arr[i].replace(/\@[^\s]*\s/g, '');
  console.log(arr[i]);
  i++;
}

【讨论】：