解释验证模式 [英] Explain Pattern for Validation

问题描述

海，

我们使用以下模式对电子邮件，Web，数字，字符进行验证，

Hai,

We are used Validate for Email, Web, numbers, characters using pattern like following,

^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$

我也用，但我听不懂.模式的语法说明了什么.
请说明...

I also using, but I can''t understand it. What is the syntax of pattern, explained it.
Please explain...

推荐答案

我也用，但我听不懂.模式的语法是什么?
请解释...

I also using, but I can''t understand it. What is the syntax of pattern, explained it.
Please explain...

检查文章以获得更好的Regiular表达式解释，
http://www.regular-expressions.info/reference.html [

Check the article to get better explanation of Regiular expression,
http://www.regular-expressions.info/reference.html[^]


^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}

/ = Begin an expression
^ = The matched string must begin here, and only begin here
\w = any word (letters, digits, underscores)
+ = match previous expression at least once, unlimited number of times
[] = match any character inside the brackets, but only match one
\+\. = match a literal + or .
\w = another word
- = match a literal -
* = match the previous expression zero or infinite times
@ = match a literal @ symbol
() = make everything inside the parentheses a group (and make them referencable)
[] = another character set
\w- = match any word or a literal -
+ = another 1 to infinity quantifier
\. = match another literal .
* = another 0 to infinity quantifier
\w+ = match a word at least once
[\w-]*\. = match a word or a dash at least zero times, followed by a literal .
() = another group
[a-z]{2,4} = match lowercase letters at least 2 times but no more than 4 times
| = "or" (does not match pipe)
\d+ = match at least 1 digit

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