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10042650
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2012-04-06T11:09:48.393
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2012-04-06T11:09:48.393
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There are a number of email validators in the public domain. As mentioned, the <a href="https://github.com/apache/commons-validator/blob/trunk/src/main/java/org/apache/commons/validator/EmailValidator.java" rel="nofollow">email validator from apache commons</a> is very much in use. There is a very interesting one <a href="https://github.com/apache/wicket/blob/master/wicket-extensions/src/main/java/org/apache/wicket/extensions/validation/validator/RfcCompliantEmailAddressValidator.java" rel="nofollow">on the apache wicket codebase</a>, which apparently is quite good as it is a 81 line regular expression. Just for fun, I will copy and paste the whole thing. <pre><code>private static final String EMAIL_PATTERN = "(?:(?:\\r\\n)?[ \\t])*(?:(?:(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t]" + ")+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:" + "\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(" + "?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ " + "\\t]))*\"(?:(?:\\r\\n)?[ \\t])*))*@(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\0" + "31]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\" + "](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+" + "(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:" + "(?:\\r\\n)?[ \\t])*))*|(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z" + "|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)" + "?[ \\t])*)*\\<(?:(?:\\r\\n)?[ \\t])*(?:@(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\" + "r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[" + " \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)" + "?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t]" + ")*))*(?:,@(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[" + " \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*" + ")(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t]" + ")+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*)" + "*:(?:(?:\\r\\n)?[ \\t])*)?(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+" + "|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r" + "\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:" + "\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t" + "]))*\"(?:(?:\\r\\n)?[ \\t])*))*@(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031" + "]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](" + "?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?" + ":(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?" + ":\\r\\n)?[ \\t])*))*\\>(?:(?:\\r\\n)?[ \\t])*)|(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?" + ":(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?" + "[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)*:(?:(?:\\r\\n)?[ \\t])*(?:(?:(?:[^()<>@,;:\\\".\\[\\] " + "\\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|" + "\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>" + "@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"" + "(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*))*@(?:(?:\\r\\n)?[ \\t]" + ")*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\\" + "\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?" + ":[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[" + "\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*|(?:[^()<>@,;:\\\".\\[\\] \\000-" + "\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(" + "?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)*\\<(?:(?:\\r\\n)?[ \\t])*(?:@(?:[^()<>@,;" + ":\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([" + "^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\"" + ".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\" + "]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*(?:,@(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\" + "[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\" + "r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] " + "\\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]" + "|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*)*:(?:(?:\\r\\n)?[ \\t])*)?(?:[^()<>@,;:\\\".\\[\\] \\0" + "00-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\" + ".|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@," + ";:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\"(?" + ":[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*))*@(?:(?:\\r\\n)?[ \\t])*" + "(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\"." + "\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t])*(?:[" + "^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]" + "]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*\\>(?:(?:\\r\\n)?[ \\t])*)(?:,\\s*(" + "?:(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\\" + "\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(" + "?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[" + "\\[\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t" + "])*))*@(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t" + "])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?" + ":\\.(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|" + "\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*|(?:" + "[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\" + "]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)*\\<(?:(?:\\r\\n)" + "?[ \\t])*(?:@(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"" + "()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)" + "?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>" + "@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*(?:,@(?:(?:\\r\\n)?[" + " \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@," + ";:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:\\r\\n)?[ \\t]" + ")*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\\" + "\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*)*:(?:(?:\\r\\n)?[ \\t])*)?" + "(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[\"()<>@,;:\\\"." + "\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])*)(?:\\.(?:(?:" + "\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z|(?=[\\[" + "\"()<>@,;:\\\".\\[\\]]))|\"(?:[^\\\"\\r\\\\]|\\\\.|(?:(?:\\r\\n)?[ \\t]))*\"(?:(?:\\r\\n)?[ \\t])" + "*))*@(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])" + "+|\\Z|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*)(?:\\" + ".(?:(?:\\r\\n)?[ \\t])*(?:[^()<>@,;:\\\".\\[\\] \\000-\\031]+(?:(?:(?:\\r\\n)?[ \\t])+|\\Z" + "|(?=[\\[\"()<>@,;:\\\".\\[\\]]))|\\[([^\\[\\]\\r\\\\]|\\\\.)*\\](?:(?:\\r\\n)?[ \\t])*))*\\>(?:(" + "?:\\r\\n)?[ \\t])*))*)?;\\s*)"; </code></pre>
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PostParentId
1. POValidating email in Java
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PostTypePostTypeId
1. PTAnswer
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UserOwnerUserId
1. USH Marcelo Morales
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1. VO
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 VTUpMod
2. VO
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