package com.zetcode; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; // Jane the 'Jane' string // ^Jane 'Jane' at the start of a string // Jane$ 'Jane' at the end of a string // ^Jane$ exact match of the string 'Jane' // [abc] a, b, or c // [a-z] any lowercase letter // [^A-Z] any character that is not a uppercase letter // (Jane|Becky) Matches either 'Jane' or 'Becky' // [a-z]+ one or more lowercase letters // ^[98]?$ digits 9, 8 or empty string // ([wx])([yz]) wy, wz, xy, or xz // [0-9] any digit // [^A-Za-z0-9] any symbol (not a number or a letter) public class JavaRegexEmail { public static void main(String[] args) { List emails = List.of("[email protected]", "andy@yahoocom", "34234sdfa#2345", "[email protected]"); String regex = "[a-zA-Z0-9._-]+@[a-zA-Z0-9-]+\\.[a-zA-Z.]{2,18}"; Pattern p = Pattern.compile(regex); for (String email : emails) { Matcher m = p.matcher(email); if (m.matches()) { System.out.printf("%s matches%n", email); } else { System.out.printf("%s does not match%n", email); } } } }