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How to find the subsequence in an input sequence that matches the pattern required in Java Regular Expressions?
The find() method finds the subsequence in an input sequence that matches the pattern required. This method is available in the Matcher class that is available in the java.util.regex package.
A program that demonstrates the method Matcher.find() in Java regular expressions is given as follows:
Example
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Demo {
public static void main(String args[]) {
Pattern p = Pattern.compile("Sun");
Matcher m = p.matcher("The Earth revolves around the Sun");
System.out.println("Subsequence: Sun");
System.out.println("Sequence: The Earth revolves around the Sun");
if (m.find())
System.out.println("
Subsequence found");
else
System.out.println("
Subsequence not found");
}
}Output
Subsequence: Sun Sequence: The Earth revolves around the Sun Subsequence found
Now let us understand the above program.
The subsequence “Sun” is searched in the string sequence "The Earth revolves around the Sun". Then the find() method is used to find if the subsequence is in the input sequence and the required result is printed. A code snippet which demonstrates this is as follows:
Pattern p = Pattern.compile("Sun");
Matcher m = p.matcher("The Earth revolves around the Sun");
System.out.println("Subsequence: Sun" );
System.out.println("Sequence: The Earth revolves around the Sun" );
if (m.find())
System.out.println("
Subsequence found");
else
System.out.println("
Subsequence not found");
Updated on: 30-Jul-2019
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