There is also a question about the why the hyphen in his code does not work:
http://stackoverflow.com/questions/7939147/preg-match-email-validation-adding-hyphen-to-domain-spot
There is also this one that works, well almost (upper case letters not allowed on this one):
http://www.developphp.com/view_lesson.php?v=224
Explanations on how to add a hyphen to the Regular Expression:
http://stackoverflow.com/questions/9589074/regex-should-hyphens-be-escaped
http://stackoverflow.com/questions/6744587/simple-regex-match-any-string-with-at-least-one-hyphen
So I tweak the code a bit to have the perfect email validation code I have seen so far, and here it is:
$email = "test@test-tester.com.ph" //<-- Works
$Syntax='/^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)*(\.[a-zA-Z]{2,3})$/';
if (preg_match($Syntax, $email)) {
echo $email . \" is a valid email. We can accept it.\";
} else {
echo $email . \" is an invalid email. Please try again.\";
}
Let me know if there is an improvement for this code.
Also a bit of caveat on the preg_match() function:
preg_match() returns 1 if the pattern matches given subject, 0 if it does not, or FALSE if an error occurred
as mentioned in PHP documentation:
