问题
I'm was using PHP eregi function, but I get the notice that it is deprecated. Here's my code:
!eregi("^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$", trim($_POST['email']))
Therefore I am trying to replace the function with the preg_match, but seems that I am unable to get the correct pattern for the preg_match, as I get error with the following code:
!preg_match("^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$", trim($_POST['email']))
Here's the error I get from above code:
Warning: preg_match(): No ending delimiter '^' found in
Thanks for any help.
回答1:
You need to use a delimiter at the beginning and end of your regex, commonly /:
!preg_match("/^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$/", trim($_POST['email']))
Manual entry: PCRE introduction / delimiters
回答2:
You need to delimit your regular expression:
preg_match("/^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$/",
^ ^
回答3:
preg_match() wants you to use a delimiter at the start or end of a regex string:
preg_match("/^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$/", trim($_POST['email']))
The delimiter can be several characters, including ~, %, #, /, @, etcetera. Notice that when you pick a delimiter, if that character is used inside the regular expression, it must be escaped with a backslash character (\). For example, using the regex
http://[0-9a-z]+\.com
with the combination of the delimiter /, will require you to escape every occurence of /:
/http:\/\/[0-9a-z]+\.com/
See the PHP manual for more information.
回答4:
Try it like,
!preg_match("/^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$/i", trim($_POST['email']))
You must use a delimiter like /
回答5:
By the way, in order to validate an email address, you can use filter_var function as well.
$is_email_valid = filter_var($email, FILTER_VALIDATE_EMAIL);
Details: http://php.net/manual/en/function.filter-var.php
来源：https://stackoverflow.com/questions/19114821/php-error-using-the-preg-match-function