Match.index無法正常工作

Question

我試圖在我的文本中找到[Key]單詞並添加一些內容。

class Program 
{ 
    private string x = "public class Table \n{\n[Key]\r\n[MaxLength(36)]\r\npublic string Char366{ get; set; }\npublic short? Blooean{ get; set; }\n[Key]\r\npublic bool Bit1{ get; set; }\npublic byte? Tinyinttunsigned{ get; set; }\npublic byte[] Binaryy{ get; set; }\npublic byte[] Varbinaryy{ get; set; }\npublic byte[] Blobb{ get; set; }\npublic byte[] Longblobb{ get; set; }\npublic DateTime Datetimee{ get; set; }\npublic decimal Decimall{ get; set; }\npublic double Doublee{ get; set; }\npublic short? Smallintt{ get; set; }\npublic int? Intt{ get; set; }\npublic long Bigintt{ get; set; }\npublic short Tinyintt{ get; set; }\n[Key]\r\npublic float Floatt{ get; set; }\n[MaxLength(1)]\r\npublic string Charr{ get; set; }\n[MaxLength(100)]\r\npublic string Varcharr{ get; set; }\npublic string Textt{ get; set; }\npublic string Longtextt{ get; set; }\npublic TimeSpan Timee{ get; set; }\npublic int? Mediumintt{ get; set; }\npublic long Biggintt{ get; set; }\npublic DateTime Datee{ get; set; }\npublic DateTime Timestampp{ get; set; }\npublic short Yearr{ get; set; }\npublic byte[] Tinyblobb{ get; set; }\npublic string Tinytextt{ get; set; }\npublic byte[] Mediumblobb{ get; set; }\npublic string Mediumtextt{ get; set; }\npublic string Longtexttm{ get; set; }\n[MaxLength(7)]\r\npublic string Enumm{ get; set; }\npublic byte[] Geometryyycol{ get; set; }\npublic byte[] Geometryyy{ get; set; }\n}"; 



    private void method() 
    { 
     var wordToFind = @"\[(Key)\]"; 
     var occurrences = Regex.Matches(x,wordToFind); 
     var timesOfOccurrences = 0; 


      foreach (Match m in occurrences) 
      { 
       timesOfOccurrences++; 
       x = x.Insert(m.Index + m.Length-1, string.Format(",Order={0}", timesOfOccurrences)); 
      } 

     Console.WriteLine(x); 
     Console.ReadLine(); 
    } 

它只適用於第一次出現的單詞。我的正則表達式有什麼問題嗎？結果如下：

Answer 1

在你的代碼中，你沒有考慮到輸入字符串在第一次迭代後被改變。您用Regex.Matches收集的索引在您將第一個[Key]替換爲[Key,Order=1] 8個字符後發生了變化。

我建議使用Regex.Replace與匹配評估器來做替換。這將是更清潔，不易出錯：

string x = "public class Table \n{\n[Key]\r\n[MaxLength(36)]\r\npublic string Char366{ get; set; }\npublic short? Blooean{ get; set; }\n[Key]\r\npublic bool Bit1{ get; set; }\npublic byte? Tinyinttunsigned{ get; set; }\npublic byte[] Binaryy{ get; set; }\npublic byte[] Varbinaryy{ get; set; }\npublic byte[] Blobb{ get; set; }\npublic byte[] Longblobb{ get; set; }\npublic DateTime Datetimee{ get; set; }\npublic decimal Decimall{ get; set; }\npublic double Doublee{ get; set; }\npublic short? Smallintt{ get; set; }\npublic int? Intt{ get; set; }\npublic long Bigintt{ get; set; }\npublic short Tinyintt{ get; set; }\n[Key]\r\npublic float Floatt{ get; set; }\n[MaxLength(1)]\r\npublic string Charr{ get; set; }\n[MaxLength(100)]\r\npublic string Varcharr{ get; set; }\npublic string Textt{ get; set; }\npublic string Longtextt{ get; set; }\npublic TimeSpan Timee{ get; set; }\npublic int? Mediumintt{ get; set; }\npublic long Biggintt{ get; set; }\npublic DateTime Datee{ get; set; }\npublic DateTime Timestampp{ get; set; }\npublic short Yearr{ get; set; }\npublic byte[] Tinyblobb{ get; set; }\npublic string Tinytextt{ get; set; }\npublic byte[] Mediumblobb{ get; set; }\npublic string Mediumtextt{ get; set; }\npublic string Longtexttm{ get; set; }\n[MaxLength(7)]\r\npublic string Enumm{ get; set; }\npublic byte[] Geometryyycol{ get; set; }\npublic byte[] Geometryyy{ get; set; }\n}"; 
var wordToFind = @"\[(Key)\]"; 
var occurrences = Regex.Matches(x, wordToFind); 
var timesOfOccurrences = 0; 
var result = Regex.Replace(x, wordToFind, m => string.Format("[{0},Order={1}]", m.Groups[1].Value, ++timesOfOccurrences)); 

見IDEONE demo

注意timesOfOccurrences是匹配評估內部遞增。