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copied!<p>OK heres about 3 examples <a href="http://www.mkyong.com/regular-expressions/how-to-validate-email-address-with-regular-expression/" rel="nofollow">http://www.mkyong.com/regular-expressions/how-to-validate-email-address-with-regular-expression/</a></p> <p>I think the one you need is</p> <pre><code>package com.mkyong.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; public class EmailValidator{ private Pattern pattern; private Matcher matcher; private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@ [A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; public EmailValidator(){ pattern = Pattern.compile(EMAIL_PATTERN); } /** * Validate hex with regular expression * @param hex hex for validation * @return true valid hex, false invalid hex */ public boolean validate(final String hex){ matcher = pattern.matcher(hex); return matcher.matches(); } </code></pre> <p>}</p> <p>Whole combination is means, email address must start with “_A-Za-z0-9-” , optional follow by “.[_A-Za-z0-9-]“, and end with a “@” symbol. The email’s domain name must start with “A-Za-z0-9″, follow by first level Tld (.com, .net) “.[A-Za-z0-9]” and optional follow by a second level Tld (.com.au, .com.my) “\.[A-Za-z]{2,}”, where second level Tld must start with a dot “.” and length must equal or more than 2 characters.</p> <p>Example</p> <pre><code>package com.mkyong.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; public class EmailValidator{ private Pattern pattern; private Matcher matcher; private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@ [A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; public EmailValidator(){ pattern = Pattern.compile(EMAIL_PATTERN); } /** * Validate hex with regular expression * @param hex hex for validation * @return true valid hex, false invalid hex */ public boolean validate(final String hex){ matcher = pattern.matcher(hex); return matcher.matches(); } </code></pre> <p>}</p>

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