This is an example of how to use Matcher.group(int group) API method to get the input subsequence captured by the given group during the previous match operation. Grouping with a Matcher implies that you should:
- Compile a String regular expression to a Pattern, using
compile(String regex)API method of Pattern. - Use
matcher(CharSequence input)API method of Pattern to create a Matcher that will match the given String input against this pattern. - Use
find()API method of Matcher to get the matches of the input with the pattern. - Use
group(int group)API method to get the input subsequence captured by the given group during the previous match operation.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatcherGroupExample {
public static void main(String args[]) {
Pattern pattern = Pattern.compile("B(ond)");
String str = "My name is Bond. James Bond.";
Matcher m = pattern.matcher(str);
m.find();
String group_0 = m.group(0);
String group_1 = m.group(1);
System.out.println("Group 0 " + group_0);
System.out.println("Group 1 " + group_1);
System.out.println(str);
m.find();
group_0 = m.group(0);
group_1 = m.group(1);
System.out.println("Group 0 " + group_0);
System.out.println("Group 1 " + group_1);
System.out.println(str);
}
}
Output:
Group 0 Bond
Group 1 ond
My name is Bond. James Bond.
Group 0 Bond
Group 1 ond
My name is Bond. James Bond.
This was an example of how to use Matcher.group(int group) API method in Java.
