javascript 如何使用正则表达式验证多封电子邮件？
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原文地址: http://stackoverflow.com/questions/9780582/
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How to validate multiple emails using Regex?
提问by John Smith
After a quick research on the Stackoverflow, I wasn't able to find any solution for the multiple email validation using regex (split JS function is not applicable, but some reason back-end of the application waits for a string with emails separated by ;).
在对 Stackoverflow 进行快速研究后，我无法找到任何使用正则表达式进行多电子邮件验证的解决方案（拆分 JS 函数不适用，但出于某种原因，应用程序的后端等待电子邮件以 分隔的字符串;） .
Here are the requirements:
以下是要求：
- Emails should be validated using the following rule:
[A-Za-z0-9\._%-]+@[A-Za-z0-9\.-]+\.[A-Za-z]{2,4} - Regex should accept
;sign as a separator - Emails can be written on multiple lines, finishing with
; - Regex may accept the end of the line as
;
- 应使用以下规则验证电子邮件：
[A-Za-z0-9\._%-]+@[A-Za-z0-9\.-]+\.[A-Za-z]{2,4} - 正则表达式应该接受
;符号作为分隔符 - 电子邮件可以写在多行上，以
; - 正则表达式可以接受行尾为
;
I come up with this solution:
我想出了这个解决方案：
^[A-Za-z0-9\._%-]+@[A-Za-z0-9\.-]+\.[A-Za-z]{2,4}(?:[;][A-Za-z0-9\._%-]+@[A-Za-z0-9\.-]+\.[A-Za-z]{2,4}?)*
but it doesn't work for point #3-4
但它不适用于第 3-4 点
So here are cases that are OK:
所以这里是可以的情况：
1. [email protected];[email protected] 2. [email protected];[email protected]; 3. [email protected]; [email protected]; [email protected];
Here are cases that are definetely NOT OK:
以下是绝对不合适的情况：
1. [email protected] [email protected] 2. [email protected], 3. [email protected] [email protected]
All sort of help will be appreciated
各种帮助将不胜感激
采纳答案by kirilloid
var email = "[A-Za-z0-9\._%-]+@[A-Za-z0-9\.-]+\.[A-Za-z]{2,4}";
var re = new RegExp('^'+email+'(;\n*'+email+')*;?$');
[ "[email protected];[email protected]",
"[email protected];[email protected];",
"[email protected];\[email protected];\[email protected]",
"[email protected] [email protected]",
"[email protected],",
"[email protected]\[email protected]" ].map(function(str){
return re.test(str);
}); // [true, true, true, false, false, false]
回答by Nicholas Carey
This is how I'm doing it (ASP.Net app, no jQuery). The list of email addresses is entered in a multi-line text box:
这就是我的做法（ASP.Net 应用程序，没有 jQuery）。在多行文本框中输入电子邮件地址列表：
function ValidateRecipientEmailList(source, args)
{
var rlTextBox = $get('<%= RecipientList.ClientID %>');
var recipientlist = rlTextBox.value;
var valid = 0;
var invalid = 0;
// Break the recipient list up into lines. For consistency with CLR regular i/o, we'll accept any sequence of CR and LF characters as an end-of-line marker.
// Then we iterate over the resulting array of lines
var lines = recipientlist.split( /[\r\n]+/ ) ;
for ( i = 0 ; i < lines.length ; ++i )
{
var line = lines[i] ; // pull the line from the array
// Split each line on a sequence of 1 or more whitespace, colon, semicolon or comma characters.
// Then, we iterate over the resulting array of email addresses
var recipients = line.split( /[:,; \t\v\f\r\n]+/ ) ;
for ( j = 0 ; j < recipients.length ; ++j )
{
var recipient = recipients[j] ;
if ( recipient != "" )
{
if ( recipient.match( /^([A-Za-z0-9_-]+\.)*[A-Za-z0-9_-]+\@([A-Za-z0-9_-]+\.)+[A-Za-z]{2,4}$/ ) )
{
++valid ;
}
else
{
++invalid ;
}
}
}
}
args.IsValid = ( valid > 0 && invalid == 0 ? true : false ) ;
return ;
}
回答by Bergi
There is no reason not to use split - in the same way the backend will obviously do.
没有理由不使用 split - 后端显然会这样做。
return str.split(/;\s*/).every(function(email) {
return /.../.test(email);
}
For good or not-so-good email regular expressions have a look at Validate email address in JavaScript?.
对于好的或不太好的电子邮件正则表达式，请查看在 JavaScript中验证电子邮件地址？.
