Question

我是正则表达式的新手，我在VBscript函数中有以下模式来验证电子邮件地址。

regEx.Pattern ="^[\w-\.]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,4}$"

1）有人请用文字说明这种模式是如何工作的吗？背后的破折号（ - ）是什么？喜欢w-，Z -

^[\w-\.]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,4}$

2）此外，如果顶级域名为2到3个字符（如.com，.edu），它看起来只返回TRUE。如何在点（。）后更改为无限制的顶级域名？例如：test1@domain1.career，test2 @ domain2.consulting

先谢谢你，

Answer 1

 ^   =   String starts with



\w  =   Ranges: matches a letter between A to B,a to b and figures from 1  to 9

 \.  =  matches character (.)

{1,} =  Occur one or more times

\@   =  matches character (@)

[\da-zA-Z-] = match a single character between digit 0-9,a-z , A-Z and -

{2,4} =  Occur 2 to 4 times

^[\w-\.]{1,} indicate abc9-. or 9ab-.

[\da-zA-Z-]{2,4} indicates 1ab or ab- or ab3-

to change unlimited top-level domain after the dot (.) change Regular Expression 

^[\w-\.]{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{1,}$

output will be: test1@domain1.career

常规Exp - 理解模式

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