C#正则表达式问题. [英] C# regex question.

问题描述

无法理解为什么我的Regex类无法实例化.正则表达式似乎很好，但是在调用"BuildStructure"时出现错误消息:

System.ArgumentException:解析"[(.* ?;)(([[(if)(while)(for)]).*?\(.*?\){({.*?})*?})]] -太多).

这是代码:

Can not get why my Regex class can not instantiate. The regular expression seems to be fine, but i''m getting error message when calling "BuildStructure":

System.ArgumentException : parsing "[(.*?;)(([(if)(while)(for)]).*?\(.*?\){({.*?})*?})]" - Too many )''s.

Here is the code:

class CodeStructureBuilder
{
private const String REGULAR_EXPRESSION =
            @"[(.*?;)([(if)(while)(for)]\s*?\(.*?\){({.*?})*?})]";

public CodeStructureBuilder() {}

public void BuildStructure()
{
    Regex regex = new Regex(REGULAR_EXPRESSION);
}
}

推荐答案

您还有一个反斜杠:

You either have an extra backslash:

"[(.*?;)([(if)(while)(for)]\s*?\(.*?\){({.*?})*?})]"

成为

"[(.*?;)([(if)(while)(for)]\s*?(.*?\){({.*?})*?})]"

或太少了:

or one too few:

"[(.*?;)([(if)(while)(for)]\s*?\(.*?\){({.*?}\)*?})]"

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