VB.NET 正则表达式替换字符串
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/16590773/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
VB.NET regular expression replace string
提问by meryloo
I have got a string that I need to replace by using wildcards in a VB.Net code. I found out that I may need to use the Regular expressions but I am new to it.
我有一个字符串，我需要在 VB.Net 代码中使用通配符来替换它。我发现我可能需要使用正则表达式，但我是新手。
I would like to change the following strings:
我想更改以下字符串：
John;-4;5John;20;15John;-255;2
John;-4;5John;20;15John;-255;2
where the -4;5etc are the changing parts of the string into newValue
其中-4;5etc 是字符串的变化部分newValue
I used a standard string replace but that does not seem to work:
我使用了标准字符串替换，但这似乎不起作用：
newString = oldString.Replace(oldString & ";" & "*" & ";" & "*", "newValue")
Your help is much appreciated.
非常感谢您的帮助。
回答by ajakblackgoat
Try:
尝试：
ResultString = Regex.Replace(SubjectString, "(-*\d+;*)+", "newValue")
This will replace any occurrence of numbers (with or without -ve sign) followed by ; or not. Therefore your sample data of
这将替换任何出现的数字（带或不带 -ve 符号）后跟 ; 或不。因此，您的样本数据
John;-4;5
John;20;15
John;-255;2
John;123;234;5;32;45;543
will become
会变成
John;newValue
回答by Andre Pageot
Use a multiline regex with the following expression
使用带有以下表达式的多行正则表达式
;(.)[-+]?\b[0-9].?[0-9]+\b
;(. )[-+]?\b[0-9].?[0-9]+\b
so maybe something like this to replace all instances with a blank string, I havent tested this because i cant at the moment but if this fails then replace the multiline with singleline
所以也许像这样的东西用空字符串替换所有实例，我还没有测试过这个，因为我现在不能，但如果这失败了，那么用单行替换多行
Dim SourceString as string = "John;-4;5" & vbcrlf & "John;20;15"
Dim ReplaceString as string = ""
Dim result As String = Regex.Replace(SourceString,";(.*)[-+]?\b[0-9]*\.?[0-9]+\b",ReplaceString,RegexOptions.IgnoreCase or RegexOptions.Multiline)
回答by Pakk
You could always try this
你可以试试这个
newString =
oldString.Replace(oldString,"newValue").replace(";","NewVal").replace("*","Newval)
this will althrough only replace chars in oldstring
这将始终只替换旧字符串中的字符
I would try this :
我会试试这个：
dim val as string = "John;-4;5" ' Or any other string like this
Dim arr() As String = val.Split(";")
'manipulate string from here
'arr(0) is John
'arr(1) is -4
'arr(2) is -5
then build your new value string
然后构建您的新值字符串
val = arr(0) & ";" & "newval" & ";" & "newVal"
