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Re: What this means "(\w|-)+@\w"?

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El 07/07/2011 15:58, zhang yun escribió/wrote:
> I have some problems in regular expression, here is code :
>      function is_email($e_name)
> {
> 	$arr = array("ac","com","net","org","edu","gov","mil","ac\.cn",
> 				"com\.cn","edu\.cn","net\.cn","org\.cn");
> 	$str = implode("|",$arr);
> 	$reg ='/^[0-9a-zA-z](\w|-)+@\w+\.('.$str.')$/';
> 	//echo $reg;
> 	if(preg_match($reg,strtolower($e_name)))
> 		return strtolower($e_name);
> 	else
> 		return false;
> }

As already mentioned, it's a terrible way to validate e-mails. Among 
other omissions, it discards like a hundred valid top level domains:

http://en.wikipedia.org/wiki/List_of_Internet_TLDs

If you are interested in the subject, I suggest you read this forum entry:

http://stackoverflow.com/questions/2514810/php-email-validation-question/2515058#2515058

I'd say the best options is to write your own simple and permissive 
expression, although you can also use a reliable third-party library and 
keep it updated. (I found 
http://code.google.com/p/php-email-address-validation/ but I have no 
references about it.)


> I don't know the exactly meaning of "(\w|-)+@\w", could you help me
> figure out its meaning? I'm new to posix standard.

Er... Sorry, this is a Perl-compatible regular expression. The Posix 
regexp functions (ereg, eregi...) are deprecated in PHP.



-- 
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://borrame.com
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What this means "(\w|-)+@\w"? zhang yun <bigzhangyun@gmail.com> - 2011-07-07 06:58 -0700
  Re: What this means "(\w|-)+@\w"? Michael Fesser <netizen@gmx.de> - 2011-07-07 17:39 +0200
  Re: What this means "(\w|-)+@\w"? Eli the Bearded <*@eli.users.panix.com> - 2011-07-07 18:23 +0000
    Re: What this means "(\w|-)+@\w"? Michael Fesser <netizen@gmx.de> - 2011-07-07 21:12 +0200
    Re: What this means "(\w|-)+@\w"? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-07-07 21:12 +0200
      Re: What this means "(\w|-)+@\w"? Eli the Bearded <*@eli.users.panix.com> - 2011-07-08 06:05 +0000
  Re: What this means "(\w|-)+@\w"? "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2011-07-08 08:42 +0200
    Re: What this means "(\w|-)+@\w"? Sandman <mr@sandman.net> - 2011-08-02 10:06 +0200
      Re: What this means "(\w|-)+@\w"? "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2011-08-02 11:50 +0200
        Re: What this means "(\w|-)+@\w"? "Peter H. Coffin" <hellsop@ninehells.com> - 2011-08-02 07:56 -0500
          Re: What this means "(\w|-)+@\w"? Eli the Bearded <*@eli.users.panix.com> - 2011-08-02 20:53 +0000
            Re: What this means "(\w|-)+@\w"? "Peter H. Coffin" <hellsop@ninehells.com> - 2011-08-03 08:32 -0500
          Re: What this means "(\w|-)+@\w"? "Álvaro G. Vicario" <alvaro.NOSPAMTHANX@demogracia.com.invalid> - 2011-08-03 10:55 +0200
            Re: What this means "(\w|-)+@\w"? "Peter H. Coffin" <hellsop@ninehells.com> - 2011-08-03 08:46 -0500
        Re: What this means "(\w|-)+@\w"? Sandman <mr@sandman.net> - 2011-08-03 00:21 +0200
          Re: What this means "(\w|-)+@\w"? Eli the Bearded <*@eli.users.panix.com> - 2011-08-03 07:45 +0000
            Re: What this means "(\w|-)+@\w"? Sandman <mr@sandman.net> - 2011-08-03 10:02 +0200
              Re: What this means "(\w|-)+@\w"? Eli the Bearded <*@eli.users.panix.com> - 2011-08-05 00:05 +0000

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