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Matcher region(int, int) method in Java with Examples

Last Updated : 30 Nov, 2022

The region(int, int) method of Matcher Class restricts the region to be matched by the pattern. This region must be lesser than or same as the previous region, but not greater. Else it would lead to IndexOutOfBoundsException. This method returns a Matcher with the new matching region. Syntax:

public Matcher region(int startIndex, int endIndex)

Parameters: This method takes two parameters:

  • startIndex which is the starting index of the new constrained region.
  • endIndex which is the ending index of the new constrained region.

Return Value: This method returns a Matcher with the region, to be matched, constrained. Exception: This method throws IndexOutOfBoundsException if:

  • startIndex or endIndex is less than zero,
  • startIndex or endIndex is greater than the length of the input sequence,
  • startIndex is greater than endIndex.

Below examples illustrate the Matcher.region() method: Example 1: 

Output:
Before changing region, Groups found are: 
Geeks
Geeks
Geeks
Geeks

After changing region, Groups found are: 
Geeks

Example 2: 

Output:
Before changing region, Groups found are: 
FGF
FGF

After changing region, Groups found are: 
FGF

Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#region-int-int-

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