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How to match a range of characters using Java regex
To match a range of characters i.e. to match all the characters between two specified characters in a sequence you can use the character class as
[a-z]
The expression “[a-zA-Z]” accepts any English alphabet.
The expression “[0-9&&[^35]]” accepts numbers except 3 and 5.
Example 1
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String args[]) {
//Reading String from user
System.out.println("Enter a String");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
String regex = "^[a-zA-Z0-9]*$";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
if(matcher.matches()) {
System.out.println("Match occurred");
} else {
System.out.println("Match not occurred");
}
}
}Output 1
Enter a String Hello Match occurred
Output 2
Enter a String sample# Match not occurred
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String args[]) {
//Reading String from user
System.out.println("Enter a String");
Scanner sc = new Scanner(System.in);
String input = sc.nextLine();
String regex = "[0-9&&[^35]]";
//Compiling the regular expression
Pattern pattern = Pattern.compile(regex);
//Retrieving the matcher object
Matcher matcher = pattern.matcher(input);
int count = 0;
while(matcher.find()) {
count++;
}
System.out.println("Occurrences :"+count);
}
}Output
Enter a String 111223333555689 Occurrences :8
Updated on: 19-Nov-2019
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