输入在字符串末尾有 & char 的正则表达式

Question

我正在使用这个正则表达式：

.*-p(.\d+)-fun\b 含义：

.* => any char at the beginning, 
-p => static string ,
(.\d+) => number in first group,
-fun => static string ,
\b => end of string ,

我的测试：

http://example.com/abcd-p48343-fun             Matched 
http://example.com/abcd-p48343-funab           not matched
http://example.com/abcd-p48343-fun&ab=1        Matched

为什么上次测试匹配？

字符串末尾的 & char 似乎将它们分成两个字符串。 http://example.com/abcd-p48343-fun&ab=1 中正则表达式不匹配的解决方案是什么？

.*-p(.\d+)-fun$ 也测试过但没有用。

Answer 1

这个正则表达式：

.*-p(.\d+)-fun$

仅匹配第一个示例：

VB.Net代码：

Dim Tests As New List(Of String)
Dim Pattern As String
Dim Parser As Regex

Tests.Add("http://example.com/abcd-p48343-fun")
Tests.Add("http://example.com/abcd-p48343-funab")
Tests.Add("http://example.com/abcd-p48343-fun&ab=1")

Pattern = ".*-p(.\d+)-fun\b"
Parser = New Regex(Pattern)
Console.WriteLine("Using pattern: " & Pattern)
For Each Test As String In Tests
    Console.WriteLine(Test & " : " & Parser.IsMatch(Test).ToString)
Next
Console.WriteLine()

Pattern = ".*-p(.\d+)-fun$"
Parser = New Regex(Pattern)
Console.WriteLine("Using pattern: " & Pattern)
For Each Test As String In Tests
    Console.WriteLine(Test & " : " & Parser.IsMatch(Test).ToString)
Next
Console.WriteLine()

Console.ReadKey()

控制台输出：

Using pattern: .*-p(.\d+)-fun\b
http://example.com/abcd-p48343-fun : True
http://example.com/abcd-p48343-funab : False
http://example.com/abcd-p48343-fun&ab=1 : True

Using pattern: .*-p(.\d+)-fun$
http://example.com/abcd-p48343-fun : True
http://example.com/abcd-p48343-funab : False
http://example.com/abcd-p48343-fun&ab=1 : False

输入在字符串末尾有 & char 的正则表达式

regex where input has & char at end of string

.net

regex

asp.net

regular-language