忽略模式时用正则表达式替换字符串 [英] string replace with regex while ignoring a pattern

问题描述

您好，我想创建一个正则表达式，以便能够用另一个字符串替换一个字符串，同时还要确保避免替换特定的模式.

例如:string是-我想买房子，这房子真好，我会{买|买|租|获得}这个地方

该应用程序应将购买替换为购买，但不要放在方括号中.我的意思是所有发生的购买都应替换为购买，但忽略属于{}的购买.

我为方括号构建的正则表达式是这样的:

Dim regex As New Regex("{([^{}]+)}")

但请帮助我创建一个正则表达式，在这里我可以替换字符串，也可以排除上述模式.

这两个单独的表达式就像:

rgx = New Regex("buy", RegexOptions.IgnoreCase)

Dim regex As New Regex("{([^{}]+)}")

解决方案

(?!{[^{]*)buy(?![^{}]*})
这就是你想要的.此正则表达式将为您提供{}中未包含的购买字词.

您可以匹配多个单词，例如(?!{[^{]*)buy|purchase(?![^{}]*})
你可以这样

  Dim  rgx  As  新 Regex(" )
 Dim 结果 As   String  = rgx.Replace (输入，替换)' 其中输入将是您的内容，替换将是要放置的单词 

解决方案是下面的方法System.Text.RegularExpression命名空间，

 Regex.Replace 

有关更多详细信息，请访问: http://msdn.microsoft.com/en-us/library/h0y2x3xs.aspx [^ ]

Hello, i want to create a regex to be able to replace a string with another string while also making sure that a particular pattern is avoided from being replaced.

Eg : string is - I wanted to buy a house and this house is so good that i will {buy|purchase|rent|acquire} this place

The application should replace buy with purchase but not in the brackets. I mean all the occurences of buy should be replaced with purchase but ignore the ones that fall under {}.

The regex that i build for the brackets is this :

Dim regex As New Regex("{([^{}]+)}")

but please help me to create a regex where i can replace string and also exclude the above pattern.

the two individual expression would be like :

rgx = New Regex("buy", RegexOptions.IgnoreCase)

Dim regex As New Regex("{([^{}]+)}")

how do i merge the two to include first and exclude second one?

解决方案

(?!{[^{]*)buy(?![^{}]*})
This is what you want. This regex will get you the buy word not enclosed in {}.

You can match multiple words like (?!{[^{]*)buy|purchase(?![^{}]*})
You can do it like

Dim rgx As New Regex("(?!{[^{]*)buy|purchase(?![^{}]*})")
Dim result As String = rgx.Replace(input, replacement) 'where input will be your content and replacement will be the word to be placed

Solution for your problem is the below method System.Text.RegularExpression namespace,

Regex.Replace

More details at: http://msdn.microsoft.com/en-us/library/h0y2x3xs.aspx[^]

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