Matcher regionStart() method in Java with Examples
The regionStart() method of Matcher Class is used to get the startIndex of the region to be matched by the pattern in the current matcher. This method returns an integer value which is the startIndex of the region of this matcher.
Syntax:
public int regionStart()
Parameters: This method takes no parameters.
Return Value: This method returns a integer value which is the startIndex of the region of this matcher.
Below examples illustrate the Matcher.regionStart() method:
Example 1:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(Geeks)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= "GeeksForGeeks Geeks for For Geeks Geek" ;
Matcher matcher
= pattern.matcher(stringToBeMatched);
System.out.println( "Before changing region, "
+ " Region starts from: "
+ matcher.regionStart());
matcher = matcher.region( 2 , 10 );
System.out.println( "After changing region, "
+ " Region starts from: "
+ matcher.regionStart());
}
}
|
Output:
Before changing region, Region starts from: 0
After changing region, Region starts from: 2
Example 2:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(F*F)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF" ;
Matcher matcher
= pattern.matcher(stringToBeMatched);
System.out.println( "Before changing region, "
+ " Region starts from: "
+ matcher.regionStart());
matcher = matcher.region( 5 , 10 );
System.out.println( "After changing region, "
+ " Region starts from: "
+ matcher.regionStart());
}
}
|
Output:
Before changing region, Region starts from: 0
After changing region, Region starts from: 5
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#regionStart–
Last Updated :
27 Nov, 2018
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