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Use a quantifier to find a match in Java
One of the quantifiers is the plus(+). This matches one or more of the subsequence specified with the sequence.
A program that demonstrates using the quantifier plus(+) to find a match in Java 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("o+");
Matcher m = p.matcher("o oo ooo");
System.out.println("The input string is: o oo ooo");
System.out.println("The Regex is: o+ ");
System.out.println();
while (m.find()) {
System.out.println("Match: " + m.group());
}
}
}Output
The input string is: o oo ooo The Regex is: o+ Match: o Match: oo Match: ooo
Now let us understand the above program.
The subsequence “o+” is searched in the string sequence "o oo ooo". Then the find() method is used to find if the subsequence i.e. o followed by any number of o is in the input sequence and the required result is printed. A code snippet which demonstrates this is as follows:
Pattern p = Pattern.compile("o+");
Matcher m = p.matcher("o oo ooo");
System.out.println("The input string is: o oo ooo");
System.out.println("The Regex is: o+ ");
System.out.println();
while (m.find()) {
System.out.println("Match: " + m.group());
}
Updated on: 30-Jul-2019
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