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Use the ? quantifier in Java Regular Expressions
In general, the ? quantifier represents 0 or 1 occurrences of the specified pattern. For example - X? means 0 or 1 occurrences of X.
The regex "t.+?m" is used to find the match in the string "tom and tim are best friends" using the ? quantifier.
A program that demonstrates this 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("t.+?m");
Matcher m = p.matcher("tom and tim are best friends");
System.out.println("The input string is: tom and tim are best friends");
System.out.println("The Regex is: t.+?m");
System.out.println();
while (m.find()) {
System.out.println("Match: " + m.group());
}
}
}Output
The input string is: tom and tim are best friends The Regex is: t.+?m Match: tom Match: tim
Now let us understand the above program.
The subsequence “t.+?m” is searched in the string sequence "tom and tim are best friends". The find() method is used to find if the subsequence i.e. t followed by any number of t and ending with m is in the input sequence and the required result is printed.
Updated on: 30-Jul-2019
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