RegExp验证电子邮件地址 [英] RegExp to validate an email address

问题描述

当我来到RegExp时，我正在阅读我的O''Reilly JavaScript The Definitive Guide

并认为我可以收紧我的JavaScript代码

检查是否有效电子邮件地址。为什么以下似乎不起作用：


var email_address =" Joe @ Schmoe" ;;

var email_regex = new RegExp（" ^（\\ \\\w +）（\ @）（\\\\ + +）（\。）（\\\\ + +）$"）;

var result = email_regex.exec（email_address ）;

alert（" result [1] = \"" + result [1] +" \" \ n" +

" result [2] = \"" + result [2] +" \" \ n" +

" result [3] = \"" ; +结果[3] +" \" \ n" +

" result [4] = \"" + result [4] +" \" ; \ n" +

" result [5] = \"" + result [5] +" \""）;

生成的警报框包含：


结果[1] =" Joe"
结果[2] =" @"

结果[3] =" Schm"
结果[4] =" o"

结果t [5] =" e"


似乎\。并没有逃避。表示文字

期间。我做错了什么？

-

你怎么没有听说过那些笨拙的员工？无论如何，谁已经无视了？

I was reading my O''Reilly JavaScript The Definitive Guide when I came
across RegExp and thought I could tighten up my JavaScript code that
checks for a valid email address. Why does the following not appear to work:

var email_address = "Joe@Schmoe";
var email_regex = new RegExp ("^(\\w+)(\@)(\\w+)(\.)(\\w+)$");
var result = email_regex.exec (email_address);
alert (" result[1] = \"" + result[1] + "\"\n" +
" result[2] = \"" + result[2] + "\"\n" +
" result[3] = \"" + result[3] + "\"\n" +
" result[4] = \"" + result[4] + "\"\n" +
" result[5] = \"" + result[5] + "\"");

The resulting alert box contains:

result[1] = "Joe"
result[2] = "@"
result[3] = "Schm"
result[4] = "o"
result[5] = "e"

It appears that the "\." is not escaping the "." to mean the literal
period. What am I doing wrong?
--
How come you don''t ever hear about gruntled employees? And who has been
dissing them anyhow?

推荐答案

"）;

var result = email_regex.exec（email_address）;

alert（" result [1] = \"" + result [1] +" \" \ n" +

" result [2] = \"" + result [2] +" \" \ n" +

" ; result [3] = \"" + result [3] +" \" \\\
" +

" result [4] = \"" + result [4] +" \" \ n" +

" result [5] = \"" + result [5] +" \" ）;


生成的警报框包含：


result [1] =" Joe"

result [2] =" @"

result [3] =" Schm"

result [4] =" o"

结果[5] =" e"


似乎\。并没有逃避。表示文字

期间。我做错了什么？

-

你怎么没有听说过那些笨拙的员工？谁无论如何都要给他们消费？

");
var result = email_regex.exec (email_address);
alert (" result[1] = \"" + result[1] + "\"\n" +
" result[2] = \"" + result[2] + "\"\n" +
" result[3] = \"" + result[3] + "\"\n" +
" result[4] = \"" + result[4] + "\"\n" +
" result[5] = \"" + result[5] + "\"");

The resulting alert box contains:

result[1] = "Joe"
result[2] = "@"
result[3] = "Schm"
result[4] = "o"
result[5] = "e"

It appears that the "\." is not escaping the "." to mean the literal
period. What am I doing wrong?
--
How come you don''t ever hear about gruntled employees? And who has been
dissing them anyhow?

>似乎\。并没有逃避。表示

literal

> It appears that the "\." is not escaping the "." to mean the
literal

期间。我做错了什么？

你有\。当你打算把\\。在RegExp字符串中。

You have "\." when you meant to put "\\." in the RegExp string.

Andrew DeFaria写道：

Andrew DeFaria wrote:

[...]
var email_regex = new RegExp（" ^（\\\\ +）（\ @）（\\\\ +）（\。）（\\\\ + +）

[...]
var email_regex = new RegExp ("^(\\w+)(\@)(\\w+)(\.)(\\w+)

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