MatchEvaluator 代理人

定義

Replace メソッドの操作中に、正規表現との一致が見つかるたびに呼び出されるメソッドを表します。Represents the method that is called each time a regular expression match is found during a Replace method operation.

public delegate System::String ^ MatchEvaluator(Match ^ match);
[System.Serializable]
public delegate string MatchEvaluator(Match match);
type MatchEvaluator = delegate of Match -> string
Public Delegate Function MatchEvaluator(match As Match) As String 

パラメーター

match
Match

Match メソッドの操作中に、1 つの正規表現で見つかった一致を表す Replace オブジェクト。The Match object that represents a single regular expression match during a Replace method operation.

戻り値

String

MatchEvaluator デリゲートが表すメソッドによって返された文字列。A string returned by the method that is represented by the MatchEvaluator delegate.

継承
MatchEvaluator
属性

次のコード例ではMatchEvaluator 、デリゲートを使用して、一致するすべての文字グループを一致の出現回数と置き換えます。The following code example uses the MatchEvaluator delegate to replace every matched group of characters with the number of the match occurrence.

#using <System.dll>

using namespace System;
using namespace System::Text::RegularExpressions;
ref class MyClass
{
public:
   static int i = 0;
   static String^ ReplaceCC( Match^ m )
   {
      
      // Replace each Regex cc match with the number of the occurrence.
      i++;
      return i.ToString();
   }

};

int main()
{
   String^ sInput;
   String^ sRegex;
   
   // The string to search.
   sInput = "aabbccddeeffcccgghhcccciijjcccckkcc";
   
   // A very simple regular expression.
   sRegex = "cc";
   Regex^ r = gcnew Regex( sRegex );
   
   // Assign the replace method to the MatchEvaluator delegate.
   MatchEvaluator^ myEvaluator = gcnew MatchEvaluator( &MyClass::ReplaceCC );
   
   // Write out the original string.
   Console::WriteLine( sInput );
   
   // Replace matched characters using the delegate method.
   sInput = r->Replace( sInput, myEvaluator );
   
   // Write out the modified string.
   Console::WriteLine( sInput );
}
// The example displays the following output:
//       aabbccddeeffcccgghhcccciijjcccckkcc
//       aabb11ddeeff22cgghh3344iijj5566kk77
using System;
using System.Text.RegularExpressions;

class MyClass
{
   static void Main(string[] args)
   {
      string sInput, sRegex;

      // The string to search.
      sInput = "aabbccddeeffcccgghhcccciijjcccckkcc";

      // A very simple regular expression.
      sRegex = "cc";

      Regex r = new Regex(sRegex);
        
      MyClass c = new MyClass();

      // Assign the replace method to the MatchEvaluator delegate.
      MatchEvaluator myEvaluator = new MatchEvaluator(c.ReplaceCC);
        
      // Write out the original string.
      Console.WriteLine(sInput);

      // Replace matched characters using the delegate method.
      sInput = r.Replace(sInput, myEvaluator);
      
      // Write out the modified string.
      Console.WriteLine(sInput);
   }

   public string ReplaceCC(Match m)
   // Replace each Regex cc match with the number of the occurrence.
   {
      i++;
      return i.ToString() + i.ToString();		
   }
   public static int i=0;
}
// The example displays the following output:
//       aabbccddeeffcccgghhcccciijjcccckkcc
//       aabb11ddeeff22cgghh3344iijj5566kk77
Imports System.Text.RegularExpressions

Module Module1
   Public Sub Main()
      Dim sInput, sRegex As String

      ' The string to search.
      sInput = "aabbccddeeffcccgghhcccciijjcccckkcc"

      ' A very simple regular expression.
      sRegex = "cc"

      Dim r As Regex = New Regex(sRegex)

      ' Assign the replace method to the MatchEvaluator delegate.
      Dim myEvaluator As MatchEvaluator = New MatchEvaluator(AddressOf ReplaceCC)

      ' Write out the original string.
      Console.WriteLine(sInput)
      ' Replace matched characters using the delegate method.
      sInput = r.Replace(sInput, myEvaluator)
      ' Write out the modified string.
      Console.WriteLine(sInput)
   End Sub

   Public Function ReplaceCC(ByVal m As Match) As String
      ' Replace each Regex match with the number of the match occurrence.
      static i as integer
   
      i = i + 1
      Return i.ToString() & i.ToString()
   End Function
End Module
' The example displays the following output:
'       aabbccddeeffcccgghhcccciijjcccckkcc
'       aabb11ddeeff22cgghh3344iijj5566kk77

注釈

MatchEvaluatorデリゲートメソッドを使用して、などRegex.Replace(String, MatchEvaluator)の置換メソッドによって検出された各一致に対して、カスタムの検証操作または操作操作を実行できます。You can use a MatchEvaluator delegate method to perform a custom verification or manipulation operation for each match found by a replacement method such as Regex.Replace(String, MatchEvaluator). メソッドはReplace 、一致した文字列ごとにMatchEvaluator 、一致を表すMatchオブジェクトを使用してデリゲートメソッドを呼び出します。For each matched string, the Replace method calls the MatchEvaluator delegate method with a Match object that represents the match. デリゲートメソッドは、任意の処理を実行し、メソッドがReplace一致する文字列の代わりに使用する文字列を返します。The delegate method performs whatever processing you prefer and returns a string that the Replace method substitutes for the matched string.

拡張メソッド

GetMethodInfo(Delegate)

指定したデリゲートによって表されるメソッドを表すオブジェクトを取得します。Gets an object that represents the method represented by the specified delegate.

適用対象

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