如何使用javascript从电子邮件地址中提取用户名？ [英] How can I extract the user name from an email address using javascript?

问题描述

谢谢。

解决方案

匹配的正则表达式

安全检查

  var str =[e-mail]; 
 var nameMatch = str.match（/ ^（[^ @] *）@ /）; 
 var name = nameMatch？ nameMatch [1]：null; 
  

写为一行

  var name = str.match（/ ^（[^ @] *）@ /）[1]; 
  

正则表达式替换

安全检查

  var str =[e-mail]; 
 var nameReplace = str.replace（/@.*$/，）; 
 var name = nameReplace！== str？ nameReplace：null; 
  

写为一行

  var name = str.replace（/@.*$/，）; 
  

拆分字符串

安全检查

  var str =[e-mail]; 
 var nameParts = str.split（@）; 
 var name = nameParts.length == 2？ nameParts [0]：null; 
  

写为一行

  var name = str.split（@）[0]; 
  

每个示例的性能测试

JSPerf测试

Given the following email address -- [e-mail] -- how can I extract someone from the address using javascript?

Thank you.

解决方案

Regular Expression with match

with safety checks

var str="[e-mail]";
var nameMatch = str.match(/^([^@]*)@/);
var name = nameMatch ? nameMatch[1] : null;

written as one line

var name = str.match(/^([^@]*)@/)[1];

Regular Expression with replace

with safety checks

var str="[e-mail]";
var nameReplace = str.replace(/@.*$/,"");
var name = nameReplace!==str ? nameReplace : null;

written as one line

var name = str.replace(/@.*$/,"");

Split String

with safety checks

var str="[e-mail]";
var nameParts = str.split("@");
var name = nameParts.length==2 ? nameParts[0] : null;

written as one line

var name = str.split("@")[0];

Performance Tests of each example

JSPerf Tests

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