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    <p>A smaller two step regex provides good results</p> <p>/** check to see if email address is in a valid format. * Leading character of mailbox must be alpha<br> * remaining characters alphanumeric plus -_ and dot<br> * domain base must be at least 2 characters<br> * domain extension must be at least 2, not more than 4 alpha<br> * Subdomains are permitted. * @version 050208 added apostrophe as valid char * @version 04/25/07 single letter email address and single <br> * letter domain names are permitted. */ public static boolean isValidEmailAddress(String address){ String sRegExp; </p> <pre><code> // 050208 using the literal that was actually in place // 050719 tweaked // 050907 tweaked, for spaces next to @ sign, two letter email left of @ ok // 042507 changed to allow single letter email addresses and single letter domain names // 080612 added trap and unit test for two adjacent @signs sRegExp = "[a-z0-9#$%&amp;]" // don't lead with dot + "[a-z0-9#$%&amp;'\\.\\-_]*" // more stuff dots OK + "@[^\\.\\s@]" // no dots or space or another @ sign next to @ sign + "[a-z0-9_\\.\\-_]*" // may or may not have more character + "\\.[a-z]{2,4}"; // ending with top level domain: com,. biz, .de, etc. boolean bTestOne = java.util.regex.Pattern.compile( sRegExp, java.util.regex.Pattern.CASE_INSENSITIVE).matcher(address).matches(); // should this work ? boolean bTwoDots = java.util.regex.Pattern.compile("\\.\\.", // no adjacent dots java.util.regex.Pattern.CASE_INSENSITIVE).matcher(address).find(); boolean bDotBefore = java.util.regex.Pattern.compile("[\\.\\s]@", //no dots or spaces before @ java.util.regex.Pattern.CASE_INSENSITIVE).matcher(address).find(); return bTestOne &amp;&amp; !bTwoDots &amp;&amp; !bDotBefore; } // end IsValidEmail </code></pre>
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