Matcher regionEnd() method in Java with Examples

The regionEnd() method of Matcher Class is used to get the endIndex of the region to be matched by the pattern in the current matcher. This method returns an integer value which is the endIndex of the region of this matcher.

Syntax:

public int regionEnd()

Parameters: This method takes no parameters.

Return Value: This method returns a integer value which is the endIndex of the region of this matcher.

Below examples illustrate the Matcher.regionEnd() method:

Example 1:

// Java code to illustrate regionEnd() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(Geeks)"; 
  
        // Create a pattern from regex 
        Pattern pattern = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "GeeksForGeeks Geeks for For Geeks Geek"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        // Get previous endIndex of region 
        // using regionEnd() method 
        System.out.println("Before changing region, "
                           + " Region ends from: "
                           + matcher.regionEnd()); 
  
        // Restrict the region to 0, 10 
        matcher = matcher.region(0, 10); 
  
        // Get previous endIndex of region 
        // using regionEnd() method 
        System.out.println("After changing region, "
                           + " Region ends from: "
                           + matcher.regionEnd()); 
    } 
} 

Output:

Before changing region,  Region ends from: 38
After changing region,  Region ends from: 10

Example 2:

// Java code to illustrate regionEnd() method 
  
import java.util.regex.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Get the regex to be checked 
        String regex = "(F*F)"; 
  
        // Create a pattern from regex 
        Pattern pattern = Pattern.compile(regex); 
  
        // Get the String to be matched 
        String stringToBeMatched 
            = "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF"; 
  
        // Create a matcher for the input String 
        Matcher matcher 
            = pattern.matcher(stringToBeMatched); 
  
        // Get previous endIndex of region 
        // using regionEnd() method 
        System.out.println("Before changing region, "
                           + " Region ends from: "
                           + matcher.regionEnd()); 
  
        // Restrict the region to 0, 5 
        matcher = matcher.region(0, 5); 
  
        // Get previous endIndex of region 
        // using regionEnd() method 
        System.out.println("After changing region, "
                           + " Region ends from: "
                           + matcher.regionEnd()); 
    } 
} 

Output:

Before changing region,  Region ends from: 35
After changing region,  Region ends from: 5

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#regionEnd–

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.

My Personal Notes

Recommended Posts: