C# - 使用正则表达式验证电话号码

Question

编辑：我解决了以下任务，但我遇到了一些问题。

任务：编写一个程序，从文本中选择正确格式的电话号码，如果匹配正则表达式，则分别列出与正则表达式的整个匹配项、国家代码和电话号码。正确的格式为：+xxx xxx xxx xxx, (xxx) xxx xxx xxx, xxx xxx xxx, xxxxxxxxx, +xxxxxxxxxxxx。我需要这个任务#C .NET 4.7.2。感谢您的帮助。

我有这个代码：

using System.Linq;
using System.Text.RegularExpressions;
                    
public class Program {
  private static string MakeRegex(params string[] patterns) {
    string SinglePattern(string pattern) => "(?:^" + string.Concat(Regex
      .Split(pattern, "(x+)")
      .Select(item => item.StartsWith('x')
         ? $"[0-9]{{{item.Length}}}"
         : string.Concat(item.Select(c => Regex.Escape(c.ToString()))))) + "$)";

     return string.Join("|", patterns.Select(pattern => SinglePattern(pattern))); 
  }
    
  public static void Main() {
    string Patterns = MakeRegex(
      "+xxx xxx xxx xxx",
      "(xxx) xxx xxx xxx",
      "xxx xxx xxx",
      "xxxxxxxxx",
      "+xxxxxxxxxxxx"
    );

    string[] PhoneNumbers = new string[] {
      "+420 000 111 222",
      "(420) 000 111 222",
      "111 000 222",
      "000111222",
      "+420000111222",
      "000111",
      "+(420) 000 111 222"
    };  
    
    string numbers = string.Join(Environment.NewLine, PhoneNumbers
      .Select(test => $"{test,20} : {(Regex.IsMatch(test, Patterns) ? "Matched" : "No")}"));
      
    string[] ns = numbers.Split('\n');
    foreach (var n in ns)
    {
        Console.WriteLine(n);       
    }
  }
}

Answer 1

拥有一个集合类似的模式

+xxx xxx xxx xxx, 
(xxx) xxx xxx xxx, 
xxx xxx xxx, 
xxxxxxxxx, 
+xxxxxxxxxxxx

我们可以借助正则表达式和Linq将它们组合成一个正则表达式：

using System.Linq;
using System.Text.RegularExpressions;

...

private static string MakeRegex(params string[] patterns) {
  static string SinglePattern(string pattern) => "(?:^" + string.Concat(Regex
    .Split(pattern, "(x+)")
    .Select(item => item.StartsWith('x')
       ? $"[0-9]{{{item.Length}}}"
       : string.Concat(item.Select(c => Regex.Escape(c.ToString()))))) + "$)";

  return string.Join("|", patterns.Select(pattern => SinglePattern(pattern))); 
}

用法

string phonePattern = MakeRegex(
  // Add / Edit / Remove patterns, if required  
  "+xxx xxx xxx xxx", 
  "(xxx) xxx xxx xxx", 
  "xxx xxx xxx", 
  "xxxxxxxxx", 
  "+xxxxxxxxxxxx"
);

...

if (Regex.IsMatch(pnumber, phonePattern)) {
  ...
}

演示：

  string phonePattern = MakeRegex(
    "+xxx xxx xxx xxx",
    "(xxx) xxx xxx xxx",
    "xxx xxx xxx",
    "xxxxxxxxx",
    "+xxxxxxxxxxxx"
  );

  string[] tests = new string[] {
    //TODO: Add more tests here
    "+123 456 789 777",
    "(123) 456 789 444",
    "123 456 789",
    "123456789",
    "+123456789567",

    "12345678",
    "1234567899",
    "1234 56 789",

    "123456789",   // Expected "Matched" (see comments below)    
    "670 230 465", // Expected "Matched" (see comments below)
    "2736896",     // Expected "No" (see comments below)
    "593683",      // Expected "No" (see comments below)
  };

  string report = string.Join(Environment.NewLine, tests
    .Select(test => $"{test,20} : {(Regex.IsMatch(test, phonePattern) ? "Matched" : "No")}"));

  Console.Write(report);

结果：

  +123 456 789 777 : Matched
 (123) 456 789 444 : Matched
       123 456 789 : Matched
         123456789 : Matched
     +123456789567 : Matched
          12345678 : No
        1234567899 : No
       1234 56 789 : No
         123456789 : Matched
       670 230 465 : Matched
           2736896 : No
            593683 : No

请fiddle你自己