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Character class: intersection - Java regular expressions
The character classes in Java regular expression is defined using the square brackets "[ ]", this subexpression matches a single character from the specified or, set of possible characters. For example the regular expression [abc] matches a single character a or, b or, c.
The intersection variant of the character class allows you to match a character which is common in the ranges that have intersection relation between them.
An intersection relation between ranges is defined using && i.e. the expression [a-z&&[r-u]] matches a single character from r to u.
Example
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample1 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input text: ");
String input = sc.nextLine();
String regex = "[a-z&&[r-u]]";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
int count =0;
while (matcher.find()) {
count++;
}
System.out.println("Number of matched characters: "+count);
}
}Output
Enter input text: how are you welcome to tutorialspoint Number of matched characters: 9
Updated on: 10-Jan-2020
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