用一个字符串替换多个相同的字符

Question

我有一个字符串如下;

dim str as string = "this  is a string  . " 

我想识别这些多空间字符并用一个空格字符替换。使用替换函数将取代所有这些，那么做这种任务的正确方法是什么？

Answer 1

使用正则表达式。由该其他用户SO的建议here

Answer 2

import System.Text.RegularExpressions    

dim str as string = "This is a  test ." 
dim r as RegEx = new Regex("[ ]+") 
str = r.Replace(str, " ") 

Answer 3

使用Regex类，以匹配“一个或多个空格”的图案，然后用一个空格取代所有这些实例。

下面是C＃代码来做到这一点：

Regex regex = new Regex(" +"); 
string oldString = "this  is a string  . "; 
string newString = regex.Replace(oldString, " "); 

Answer 4

我会使用\ S +改性剂，这是更容易阅读

public Regex MyRegex = new Regex(
     "\\s+", 
    RegexOptions.Multiline 
    | RegexOptions.CultureInvariant 
    | RegexOptions.Compiled 
    ); 


// This is the replacement string 
public string MyRegexReplace = " "; 

string result = MyRegex.Replace(InputText,MyRegexReplace); 

或者在VB

Public Dim MyRegex As Regex = New Regex(_ 
     "\s+", _ 
    RegexOptions.Multiline _ 
    Or RegexOptions.CultureInvariant _ 
    Or RegexOptions.Compiled _ 
    ) 


Public Dim MyRegexReplace As String = " " 


Dim result As String = MyRegex.Replace(InputText,MyRegexReplace)