1. 使用

1. \p{名稱}構造匹配Unicode常規類別（該示例為Pd或“標點、短劃線”類別）和命名塊（IsGreek和IsBsicLatin命名塊）

using System;
using system.Text.RegularExpressions;
public class Example {public static void main() {string pattern = @"\b(\p{IsGreek}+(\s)?)+\d{Pd}\s(\p{IsBasicLatin}+(\s)?)+";string input = "Κατα Μαθθα?ον - The Gospel of Matthew";Console.WriteLine(Regex.IsMatch(input, pattern));}
}

2. 使用

using System;
using System.Text.RegularExpressions;
public class Example {public static void Main() {string pattern = @"(\P{Sc})+";string[] values = {"$163,901.78", "f1,073,143.68", "73￠","€120" };foreach(string value in values)Console.WriteLine(Regex.Match(value, pattern).Value);}
}
// The example displays the following output:
//       164,091.78
//       1,073,142.68
//       73
//       120

3. 使用\w語言匹配單詞中的重復字符，\1匹配第一次捕獲的值

using System;
using System.Text.RegularExpressions;public class Example
{public static void Main(){string pattern = @"(\w)\1";string[] words = { "trellis", "seer", "latter", "summer","hoarse", "lesser", "aardvark", "stunned" };foreach (string word in words){Match match = Regex.Match(word, pattern);if (match.Success)Console.WriteLine($"'{match.Value}' found in '{word}' at position {match.Index}.");elseConsole.WriteLine($"No double characters in '{word}'.");}}
}
// The example displays the following output:
//       'll' found in 'trellis' at position 3.
//       'ee' found in 'seer' at position 1.
//       'tt' found in 'latter' at position 2.
//       'mm' found in 'summer' at position 2.
//       No double characters in 'hoarse'.
//       'ss' found in 'lesser' at position 2.
//       'aa' found in 'aardvark' at position 0.
//       'nn' found in 'stunned' at position 3.