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Regular Expression a|b Metacharacter in Java
The subexpression/metacharacter “a| b” matches either a or b.
Example 1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
public static void main( String args[] ) {
String regex = "Hello|welcome";
String input = "Hello how are you welcome to Tutorialspoint";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(input);
int count = 0;
while(m.find()) {
count++;
}
System.out.println("Number of matches: "+count);
}
}Output
Number of matches: 2
Example 2
The following Java program reads gender value from the user and, it only allows M (male), F(Female) or, O(Others).
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexExample {
public static void main( String args[] ) {
//Regular expression to match M or, F or, O
String regex = "M|F|O";
Scanner sc = new Scanner(System.in);
System.out.println("Enter students gender:");
String name = sc.nextLine();
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(name);
if(m.matches()) {
System.out.println("All OK");
} else {
System.out.println("Wrong Input");
}
}
}Output 1
Enter students gender: M All OK
Output 2
Enter students gender: male Wrong Input
Updated on: 19-Nov-2019
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