Operator logik ungkapan biasa Java

Java Ungkapan biasa menyokong 3 pengendali logik iaitu −

• #🎜🎜 diikuti oleh #XY🎜 🎜#

X|Y: X atau Y
(X): menangkap kumpulan 🎜##🎜🎜.
• XY: Terjemahan bahasa Cina bagi Demo

  import java.util.Scanner;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  public class Test {
     public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter input text: ");
        String input = sc.nextLine();
        String regex = "am";
        //Creating a pattern object
        Pattern pattern = Pattern.compile(regex);
        //Matching the compiled pattern in the String
        Matcher matcher = pattern.matcher(input);
        if (matcher.find()) {
           System.out.println("Match occurred");
        } else {
           System.out.println("Match not occurred");
        }
     }
  }

  Output 1
ialah:

Output1

Enter input text:
sample text
Match occurred

🎜#Output rr 🎜🎜#X|Y

Ini sepadan dengan salah satu daripada dua ungkapan/karakter di sekeliling "|"

Contoh

Demo Langsung#🎜

Enter input text:
hello how are you
Match not occurred

Output

import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
   public static void main( String args[] ) {
      String regex = "Hello|welcome";
      String input = "Hello how are you welcome to Tutorialspoint";
      Pattern pattern = Pattern.compile(regex);
      Matcher matcher = pattern.matcher(input);
      int count = 0;
      while(matcher.find()) {
         count++;
      }
      System.out.println("Number of matches: "+count);
   }
}

(X): Menangkap Kumpulan

Menangkap kumpulan membolehkan anda menganggap berbilang aksara sebagai satu unit. Anda hanya meletakkan aksara ini dalam sepasang kurungan.

Contoh

Demonstrasi masa nyata

Number of matches: 2

Output

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CapturingGroups {
   public static void main( String args[] ) {
      System.out.println("Enter input text");
      Scanner sc = new Scanner(System.in);
      String input = sc.nextLine();
      String regex = "(.*)(\d+)(.*)";
      //Create a Pattern object
      Pattern pattern = Pattern.compile(regex);
      //Now create matcher object.
      Matcher matcher = pattern.matcher(input);
      if (matcher.find( )) {
         System.out.println("Found value: " + matcher.group(0) );
         System.out.println("Found value: " + matcher.group(1) );
         System.out.println("Found value: " + matcher.group(2) );
         System.out.println("Found value: " + matcher.group(3) );
      } else {
         System.out.println("NO MATCH");
      }
   }
}

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