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.