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Use Pattern class to match in Java
The representation of the regular expressions are available in the java.util.regex.Pattern class. This class basically defines a pattern that is used by the regex engine.
A program that demonstrates using the Pattern class to 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("p+");
Matcher m = p.matcher("apples and peaches are tasty");
System.out.println("The input string is: apples and peaches are tasty");
System.out.println("The Regex is: p+ ");
System.out.println();
while (m.find()) {
System.out.println("Match: " + m.group());
}
}
}
Output
The input string is: apples and peaches are tasty The Regex is: p+ Match: pp Match: p
Now let us understand the above program.
The subsequence “p+” is searched in the string sequence "apples and peaches are tasty". The Pattern class defines the pattern that is used by the regex engine i.e. “p+”. The find() method is used to find if the subsequence i.e. p followed by any number of p is in the input sequence and the required result is printed. A code snippet which demonstrates this is as follows −
Pattern p = Pattern.compile("p+");
Matcher m = p.matcher("apples and peaches are tasty");
System.out.println("The input string is: apples and peaches are tasty");
System.out.println("The Regex is: p+ ");
System.out.println();
while (m.find()) {
System.out.println("Match: " + m.group());
}
Updated on: 2020-06-30T08:33:56+05:30
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