ereg / POSIX question

moondog · 05-10-2006, 01:32 PM

Trying to do a quick down, dirty, and crude validation of an email address. I have:

PHP Code:

  if(ereg('[[:alnum:]]@[[:alnum:]][.][[:alnum:]]', $_POST[email])) { echo "valid email";}

else {echo "invalid email";}

the probem is that is keeps kicking everything out.

If I remove anything after the period (in the domain) like this:

PHP Code:

  if(ereg('[[:alnum:]]@[[:alnum:]]', $_POST[email])) { echo "valid email";}

else {echo "invalid email";}

it works fine, but I wanted to add the check for the TLD on the domain of the email address. I tried with and without the character class around the period:

PHP Code:

  if(ereg('[[:alnum:]]@[[:alnum:]].[[:alnum:]]', $_POST[email])) { echo "valid email";}

else {echo "invalid email";}

but it still kicks everything out.

Suggestions?

-Bob

sdsinc · 05-10-2006, 02:10 PM

Works fine with me. What E-mail address are you using for testing ?
Are you sure the E-mail is not altered in the POST request ?

Also if you want to get extreme you may want to look into raw RFC822 validation:
http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html
but I think it would be overkill ;-)

Shorty · 05-10-2006, 02:14 PM

Use this instead:

Code:

if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})", $_POST['email']))

moondog · 05-10-2006, 02:39 PM

Thanks shorty.

**Eric** · 05-10-2006, 04:57 PM

Quote:

Originally Posted by Shorty

Use this instead:

Code:

if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})", $_POST['email']))

Thought I'd point out, using:

PHP Code:

  if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})", $_POST['email']))

Would cut out a few extensions

Instead use:

PHP Code:

  if(!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,6})", $_POST['email']))

Peter · 05-10-2006, 08:40 PM

I personally use :-

PHP Code:

  eregi('^[a-z0-9\._-]+@[a-z0-9\._-]+\.[a-z0-9\.]+$',$email_addy,$dummy)

moondog · 05-11-2006, 09:10 AM

Quote:

Originally Posted by SecondVersion

Would cut out a few extensions

Ah, yes, Don't want the .COOP, .AERO, and .MUSEUM folks to feel left out.

-Bob

mikesherov · 05-11-2006, 01:49 PM

From PHP.net, if you like overkill:

PHP Code:

  <?php

// Completely update for match RFC 2822 and RFC 1035

// http://www.faqs.org/rfcs/rfc2822.html

// http://www.faqs.org/rfcs/rfc1035.html

 
// Example results:

 
$email[] = 'foo@example.com';                      // matched

$email[] = 'foo.bar@example.co.uk';                // matched

$email[] = 'foo_bar@example.com';                  // matched

$email[] = '_foo_bar@example.com';                // matched

$email[] = 'foo@example.example';                  // matched

$email[] = '%#a+f.*&654_-._@ee.xx';                // matched

$email[] = 'foo@abc-123.xx';                      // matched

$email[] = 'a@a.a.a.a.aa';                        // matched

$email[] = 'a@a9.aa';                              // matched

$email[] = 'a!b#c$d%e^f&g*h\'i+j-k{l|m}n_/@op.qr'; //matched

 
$email[] = '';                                    //separator

 
$email[] = 'foo@-example.com';                    // not matched

$email[] = 'foo@example-.com';                    // not matched

$email[] = '%#af.*&@a%#b.xx';                      // not matched

$email[] = 'a@a.99.00.a.aa';                      // not matched

$email[] = '_-._@-.--';                            // not matched

$email[] = 'any..thing@bla.bla';                  // not matched

$email[] = '@.';                                  // not matched

$email[] = '@.com';                                // not matched

$email[] = '@exam@exam.com';                      // not matched

$email[] = ' @ .com';                              // not matched

$email[] = '.bar@example.com';                    // not matched

$email[] = 'foo.@example.com';                    // not matched

$email[] = 'foo@example.x';                        // not matched

 
$atom = '[-a-z0-9!#$%&\'*+/=?^_`{|}~]';    // allowed characters for part before "at" character

$domain = '([a-z0-9]([-a-z0-9]*[a-z0-9]+)?)'; // allowed characters for part after "at" character

 
$regex = '^' . $atom . '+' .        // One or more atom characters.

'(\.' . $atom . '+)*'.              // Followed by zero or more dot separated sets of one or more atom characters.

'@'.                                // Followed by an "at" character.

'(' . $domain . '{1,63}\.)+'.        // Followed by one or max 63 domain characters (dot separated).

$domain . '{2,63}'.                  // Must be followed by one set consisting a period of two

'$';                                // or max 63 domain characters.

 
foreach ($email as $example) {

   if (strlen($example) == 0):

       echo '&nbsp;<br>';

   else:

     if (eregi($regex, $example)):

       echo $example . ' matched<br>';

     else:

       echo '<strong>'. $example . ' not matched</strong><br>';

     endif;

   endif;

}

?>

05-10-2006, 01:32 PM	#1 (permalink)
moondog NamePros Regular Join Date: Jun 2004 Posts: 476 3,677.00 NP$ (Donate)	ereg / POSIX question Trying to do a quick down, dirty, and crude validation of an email address. I have: PHP Code: `if(ereg('[[:alnum:]]@[[:alnum:]][.][[:alnum:]]', $_POST[email])) { echo "valid email";} else {echo "invalid email";}` the probem is that is keeps kicking everything out. If I remove anything after the period (in the domain) like this: PHP Code: `if(ereg('[[:alnum:]]@[[:alnum:]]', $_POST[email])) { echo "valid email";} else {echo "invalid email";}` it works fine, but I wanted to add the check for the TLD on the domain of the email address. I tried with and without the character class around the period: PHP Code: `if(ereg('[[:alnum:]]@[[:alnum:]].[[:alnum:]]', $_POST[email])) { echo "valid email";} else {echo "invalid email";}` but it still kicks everything out. Suggestions? -Bob __________________ The mass purge has begun.

05-10-2006, 02:10 PM	#2 (permalink)
sdsinc Domains my Dominion Join Date: Aug 2005 Location: Web 1.0 Posts: 6,285 1,095.94 NP$ (Donate)	Works fine with me. What E-mail address are you using for testing ? Are you sure the E-mail is not altered in the POST request ? Also if you want to get extreme you may want to look into raw RFC822 validation: http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html but I think it would be overkill ;-) __________________ Buy now - MassDeveloper.com $500

05-10-2006, 02:39 PM	#4 (permalink)
moondog NamePros Regular Join Date: Jun 2004 Posts: 476 3,677.00 NP$ (Donate)	Thanks shorty. __________________ The mass purge has begun.

05-10-2006, 08:40 PM	#6 (permalink)
Peter Senior Member Join Date: Nov 2003 Location: Scotland Posts: 4,900 0.60 NP$ (Donate)	I personally use :- PHP Code: `eregi('^[a-z0-9\._-]+@[a-z0-9\._-]+\.[a-z0-9\.]+$',$email_addy,$dummy)` __________________ Manage your portfolio using my new Domain Portfolio Management script. Securing Your Domain Name From Theft

05-11-2006, 01:49 PM	#8 (permalink)
mikesherov NamePros Member Join Date: Apr 2005 Posts: 116 134.00 NP$ (Donate)	From PHP.net, if you like overkill: PHP Code: <?php // Completely update for match RFC 2822 and RFC 1035 // http://www.faqs.org/rfcs/rfc2822.html // http://www.faqs.org/rfcs/rfc1035.html // Example results: $email[] = 'foo@example.com'; // matched $email[] = 'foo.bar@example.co.uk'; // matched $email[] = 'foo_bar@example.com'; // matched $email[] = '_foo_bar@example.com'; // matched $email[] = 'foo@example.example'; // matched $email[] = '%#a+f.&654_-._@ee.xx'; // matched $email[] = 'foo@abc-123.xx'; // matched $email[] = 'a@a.a.a.a.aa'; // matched $email[] = 'a@a9.aa'; // matched $email[] = 'a!b#c$d%e^f&gh\'i+j-k{l\|m}n_/@op.qr'; //matched $email[] = ''; //separator $email[] = 'foo@-example.com'; // not matched $email[] = 'foo@example-.com'; // not matched $email[] = '%#af.&@a%#b.xx'; // not matched $email[] = 'a@a.99.00.a.aa'; // not matched $email[] = '_-._@-.--'; // not matched $email[] = 'any..thing@bla.bla'; // not matched $email[] = '@.'; // not matched $email[] = '@.com'; // not matched $email[] = '@exam@exam.com'; // not matched $email[] = ' @ .com'; // not matched $email[] = '.bar@example.com'; // not matched $email[] = 'foo.@example.com'; // not matched $email[] = 'foo@example.x'; // not matched $atom = '[-a-z0-9!#$%&\'+/=?^_`{\|}~]'; // allowed characters for part before "at" character $domain = '([a-z0-9]([-a-z0-9][a-z0-9]+)?)'; // allowed characters for part after "at" character $regex = '^' . $atom . '+' . // One or more atom characters. '(\.' . $atom . '+)'. // Followed by zero or more dot separated sets of one or more atom characters. '@'. // Followed by an "at" character. '(' . $domain . '{1,63}\.)+'. // Followed by one or max 63 domain characters (dot separated). $domain . '{2,63}'. // Must be followed by one set consisting a period of two '$'; // or max 63 domain characters. foreach ($email as $example) { if (strlen($example) == 0): echo ' <br>'; else: if (eregi($regex, $example)): echo $example . ' matched<br>'; else: echo '<strong>'. $example . ' not matched</strong><br>'; endif; endif; } ?>

05-10-2006, 02:14 PM	#3 (permalink)
Shorty Senior Member Join Date: Sep 2005 Location: England Posts: 1,035 102.05 NP$ (Donate)	Use this instead: Code: if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)@[a-z0-9-]+(\.[a-z0-9-]+)(\.[a-z]{2,3})", $_POST['email']))

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