C#正则表达式-接受字符串中的空格 [英] C# Regex - Accept spaces in a string

问题描述

我有一个需要对某些字段进行验证的应用程序.其中之一是姓氏，可以由2个单词组成.在我的正则表达式中，我必须接受这些空格，所以我尝试了很多事情，但没有找到任何解决方案.

I have an application which needs some verifications for some fields. One of them is for a last name which can be composed of 2 words. In my regex, I have to accept these spaces so I tried a lot of things but I did'nt find any solution.

这是我的正则表达式:

@"^[a-zA-Zàéèêçñ\s][a-zA-Zàéèêçñ-\s]+$"

\ s 通常用于空格，但是它不起作用，并且出现了此错误消息:

The \s are normally for the spaces but it does not work and I got this error message :

parsing "^[a-zA-Zàéèêçñ\s][a-zA-Zàéèêçñ-\s]+$" - Cannot include class \s in character range.

有个好主意吗?

推荐答案

-表示字符范围，就像您使用 AZ 来描述A和Z .您的正则表达式使用ñ-\ s ，引擎尝试将其解释为ñ和\ s 之间的任何字符-然后注意到，该 \ s 并没有太多意义，因为 \ s 本身只是任何空白字符的缩写.

- denotes a character range, just as you use A-Z to describe any character between A and Z. Your regex uses ñ-\s which the engine tries to interpret as any character between ñ and \s -- and then notices, that \s doesn't make a whole lot of sense there, because \s itself is only an abbreviation for any whitespace character.

那是错误的出处.

要摆脱这一点，如果要包含-文字字符:

To get rid of this, you should always put - at the end of your character class, if you want to include the - literal character:

@"^[a-zA-Zàéèêçñ\s][a-zA-Zàéèêçñ\s-]+$"

通过这种方式，引擎知道 \ s-不是字符范围，而是两个字符 \ s 和-分开.

This way, the engine knows that \s- is not a character range, but the two characters \s and - seperately.

另一种方法是转义-字符:

The other way is to escape the - character:

@"^[a-zA-Zàéèêçñ\s][a-zA-Zàéèêç\-\s]+$"

因此，现在引擎将ñ\-\ s 解释为不是字符范围，而是解释为任何字符ñ，-或 \ s .就个人而言，尽管我总是尽量避免转义，因为恕我直言，它会变得杂乱无章，并不必要地延长表达式的长度.

So now the engine interprets ñ\-\s not as a character range, but as any of the characters ñ, - or \s. Personally, though I always try to avoid escaping as often as possible, because IMHO it clutters up and needlessly stretches the expression in length.

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