PHP preg_match failing for no reason? Blame UTF-16.

Recently, I’ve been trying to replace tabs in a document, and I was surprised when my very simple regex, ‘/\t+/’, couldn’t match two tabs while Sublime Text could easily run the same find/replace without a hitch. It turns out that the document was encoded in UTF-16, which PHP’s preg_* functions doesn’t support. UTF-16 adds a […]

How to validate email addresses in PHP

How to validate email addresses in PHP This regex will match email adresses. However, it’s not bulletproof. Emails such as n@n.n or ____@–… would still pass validation. /^([a-z0-9_\.\+-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$/ If you are using PHP, you can also use filter_var() and save yourself some headaches. As illustrated here, it correctly validates most addresses. filter_var(‘’, FILTER_VALIDATE_EMAIL); //Returns true […]

How to properly validate email addresses in Java

If you are using Java, the InternetAddress class will validate your emails against the RFC 822 standard. The function below will filter out most invalid emails quickly: public static boolean isValidEmailAddress(String email) { try { new InternetAddress(email).validate(); } catch (AddressException ex) { return false; } return true; } This regex will also match email adresses. […]