RegexOptions Enumerazione

Definizione

public enum class RegexOptions

[System.Flags]
public enum RegexOptions

[<System.Flags>]
type RegexOptions = 

Public Enum RegexOptions

Ereditarietà

Object

ValueType

Enum

RegexOptions

Attributi

FlagsAttribute

Campi

Esempio

Nell'esempio seguente vengono definite due espressioni regolari che identificano parole ripetute nel testo, ma che vengono create istanze usando valori diversi RegexOptions . La prima espressione regolare non fa distinzione tra maiuscole e minuscole; la distinzione tra maiuscole e minuscole viene ignorata quando si determina se una parola è identica alla parola precedente. La seconda espressione regolare fa distinzione tra maiuscole e minuscole; una parola deve corrispondere esattamente al caso della parola precedente per essere considerata un duplicato.

using System;
using System.Text.RegularExpressions;

public class Test
{
    public static void Main ()
    {
        // Define a case-insensitive regular expression for repeated words.
        Regex rxInsensitive = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b",
          RegexOptions.Compiled | RegexOptions.IgnoreCase);
        // Define a case-sensitive regular expression for repeated words.
        Regex rxSensitive = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b",
          RegexOptions.Compiled);

        // Define a test string.        
        string text = "The the quick brown fox  fox jumps over the lazy dog dog.";
        
        // Find matches using case-insensitive regular expression.
        MatchCollection matches = rxInsensitive.Matches(text);

        // Report the number of matches found.
        Console.WriteLine("{0} matches found in:\n   {1}", 
                          matches.Count, 
                          text);

        // Report on each match.
        foreach (Match match in matches)
        {
            GroupCollection groups = match.Groups;
            Console.WriteLine("'{0}' repeated at positions {1} and {2}",  
                              groups["word"].Value, 
                              groups[0].Index, 
                              groups[1].Index);
        }
        Console.WriteLine();
        
        // Find matches using case-sensitive regular expression.
        matches = rxSensitive.Matches(text);

        // Report the number of matches found.
        Console.WriteLine("{0} matches found in:\n   {1}", 
                          matches.Count, 
                          text);

        // Report on each match.
        foreach (Match match in matches)
        {
            GroupCollection groups = match.Groups;
            Console.WriteLine("'{0}' repeated at positions {1} and {2}",  
                              groups["word"].Value, 
                              groups[0].Index, 
                              groups[1].Index);
        }
    }
}
// The example produces the following output to the console:
//       3 matches found in:
//          The the quick brown fox  fox jumps over the lazy dog dog.
//       'The' repeated at positions 0 and 4
//       'fox' repeated at positions 20 and 25
//       'dog' repeated at positions 50 and 54
//       
//       2 matches found in:
//          The the quick brown fox  fox jumps over the lazy dog dog.
//       'fox' repeated at positions 20 and 25
//       'dog' repeated at positions 50 and 54

Imports System.Text.RegularExpressions

Public Module Test

    Public Sub Main()
        ' Define a case-insensitive regular expression for repeated words.
        Dim rxInsensitive As New Regex("\b(?<word>\w+)\s+(\k<word>)\b", _
               RegexOptions.Compiled Or RegexOptions.IgnoreCase)
        ' Define a case-sensitive regular expression for repeated words.
        Dim rxSensitive As New Regex("\b(?<word>\w+)\s+(\k<word>)\b", _
               RegexOptions.Compiled)

        ' Define a test string.        
        Dim text As String = "The the quick brown fox  fox jumps over the lazy dog dog."
        
        ' Find matches using case-insensitive regular expression.
        Dim matches As MatchCollection = rxInsensitive.Matches(text)

        ' Report the number of matches found.
        Console.WriteLine("{0} matches found in:", matches.Count)
        Console.WriteLine("   {0}", text)

        ' Report on each match.
        For Each match As Match In matches
            Dim groups As GroupCollection = match.Groups
            Console.WriteLine("'{0}' repeated at positions {1} and {2}", _ 
                              groups.Item("word").Value, _
                              groups.Item(0).Index, _
                              groups.Item(1).Index)
        Next
        Console.WriteLine()
        
        ' Find matches using case-sensitive regular expression.
        matches = rxSensitive.Matches(text)

        ' Report the number of matches found.
        Console.WriteLine("{0} matches found in:", matches.Count)
        Console.WriteLine("   {0}", text)

        ' Report on each match.
        For Each match As Match In matches
            Dim groups As GroupCollection = match.Groups
            Console.WriteLine("'{0}' repeated at positions {1} and {2}", _ 
                              groups.Item("word").Value, _
                              groups.Item(0).Index, _
                              groups.Item(1).Index)
        Next
        Console.WriteLine()
    End Sub
End Module
' The example produces the following output to the console:
'       3 matches found in:
'          The the quick brown fox  fox jumps over the lazy dog dog.
'       'The' repeated at positions 0 and 4
'       'fox' repeated at positions 20 and 25
'       'dog' repeated at positions 50 and 54
'       
'       2 matches found in:
'          The the quick brown fox  fox jumps over the lazy dog dog.
'       'fox' repeated at positions 20 and 25
'       'dog' repeated at positions 50 and 54

Commenti

Un RegexOptions valore può essere fornito come parametro ai membri seguenti della Regex classe :

• Costruttore della Regex.Regex(String, RegexOptions) classe.

• Metodo Regex.Split(String, String, RegexOptions) .

• Metodo Regex.IsMatch(String, String, RegexOptions) .

• Metodo Regex.Match(String, String, RegexOptions) .

• Metodo Regex.Matches(String, String, RegexOptions) .

• Metodi Regex.Replace(String, String, String, RegexOptions) e Regex.Replace(String, String, MatchEvaluator, RegexOptions).

Un RegexOptions valore può anche essere fornito come parametro al RegexCompilationInfo costruttore oppure può essere assegnato direttamente alla RegexCompilationInfo.Options proprietà . L'oggetto risultante RegexCompilationInfo viene quindi utilizzato nella chiamata al Regex.CompileToAssembly metodo .

Diverse opzioni fornite dai membri dell'enumerazione RegexOptions (in particolare, dai relativi ExplicitCapturemembri , , IgnoreCaseMultilinee Singleline ) possono essere fornite usando un carattere di opzione inline nel criterio di espressione regolare. Per informazioni dettagliate, vedere Opzioni di espressione regolare.

Si applica a

Vedi anche

• Options
• Opzioni di espressione regolare