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<?php
////////////////////////////////////////////////////////////////////////
//
// validateEmailFormat.php - v 1.0
//
// PHP translation of Email Regex Program (optimized)
// Derived from:
// Appendix B - Email Regex Program
// _Mastering Regular Expressions_ (First Edition, May 1997 revision)
// by Jeffrey E.F. Friedl
// Copyright 1997 O'Reilly & Associates
// ISBN: 1-56592-257-3
// For more info on this title, see:
// http://www.oreilly.com/catalog/regex/
// For original perl version, see:
// http://examples.oreilly.com/regex/
//
// Follows RFC 822 about as close as is possible.
// http://www.faqs.org/rfcs/rfc822.html
//
//
// DESCRIPTION:
// bool validateEmailFormat ( string string )
//
// Returns TRUE if the email address passed is in a valid format
// according to RFC 822, returns FALSE if email address passed
// is not in a valid format.
//
// EXAMPLES:
// Example #1:
// $email = "Jeffy <\"That Tall Guy\"@foo.com (blah blah blah)";
// $isValid = validateEmailFormat($email);
// if($isValid) {
// ... // Yes, the above address is a valid format!
// } else {
// echo "sorry, that address isn't formatted properly.";
// }
//
// Example #2:
// $email = "foo@bar.co.il";
// $isValid = validateEmailFormat($email);
// if($isValid) {
// ...
// } else {
// echo "sorry ...";
// }
//
// Translated by Clay Loveless <clay@killersoft.com> on March 11, 2002
// ... in hopes that the "here's how to check an e-mail address!"
// discussion can finally end. After all ...
//
// Friedl is the master -- Hail to the King, baby!
//
////////////////////////////////////////////////////////////////////////
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// Hell, it might not even work for you.
//
// By using this code you agree to indemnify Clay Loveless,
// KillerSoft, and Crawlspace, Inc. from any liability that might
// arise from its use.
//
// Have fun!
//
////////////////////////////////////////////////////////////////////////
function validateEmailFormat ( $email ) {
// Some shortcuts for avoiding backslashitis
$esc = '\\\\'; $Period = '\.';
$space = '\040'; $tab = '\t';
$OpenBR = '\['; $CloseBR = '\]';
$OpenParen = '\('; $CloseParen = '\)';
$NonASCII = '\x80-\xff'; $ctrl = '\000-\037';
$CRlist = '\n\015'; // note: this should really be only \015.
// Items 19, 20, 21 -- see table on page 295 of 'Mastering Regular Expressions'
$qtext = "[^$esc$NonASCII$CRlist\"]"; // for within "..."
$dtext = "[^$esc$NonASCII$CRlist$OpenBR$CloseBR]"; // for within [...]
$quoted_pair = " $esc [^$NonASCII] "; // an escaped character
// *********************************************
// Items 22 and 23, comment.
// Impossible to do properly with a regex, I make do by allowing at most
// one level of nesting.
$ctext = " [^$esc$NonASCII$CRlist()] ";
// $Cnested matches one non-nested comment.
// It is unrolled, with normal of $ctext, special of $quoted_pair.
$Cnested = "";
$Cnested .= "$OpenParen"; // (
$Cnested .= "$ctext*"; // normal*
$Cnested .= "(?: $quoted_pair $ctext* )*"; // (special normal*)*
$Cnested .= "$CloseParen"; // )
// $comment allows one level of nested parentheses
// It is unrolled, with normal of $ctext, special of ($quoted_pair|$Cnested)
$comment = "";
$comment .= "$OpenParen"; // (
$comment .= "$ctext*"; // normal*
$comment .= "(?:"; // (
$comment .= "(?: $quoted_pair | $Cnested )"; // special
$comment .= "$ctext*"; // normal*
$comment .= ")*"; // )*
$comment .= "$CloseParen"; // )
// *********************************************
// $X is optional whitespace/comments
$X = "";
$X .= "[$space$tab]*"; // Nab whitespace
$X .= "(?: $comment [$space$tab]* )*"; // If comment found, allow more spaces
// Item 10: atom
$atom_char = "[^($space)<>\@,;:\".$esc$OpenBR$CloseBR$ctrl$NonASCII]";
$atom = "";
$atom .= "$atom_char+"; // some number of atom characters ...
$atom .= "(?!$atom_char)"; // ... not followed by something that
// could be part of an atom
// Item 11: doublequoted string, unrolled.
$quoted_str = "";
$quoted_str .= "\""; // "
$quoted_str .= "$qtext *"; // normal
$quoted_str .= "(?: $quoted_pair $qtext * )*"; // ( special normal* )*
$quoted_str .= "\""; // "
// Item 7: word is an atom or quoted string
$word = "";
$word .= "(?:";
$word .= "$atom"; // Atom
$word .= "|"; // or
$word .= "$quoted_str"; // Quoted string
$word .= ")";
// Item 12: domain-ref is just an atom
$domain_ref = $atom;
// Item 13: domain-literal is like a quoted string, but [...] instead of "..."
$domain_lit = "";
$domain_lit .= "$OpenBR"; // [
$domain_lit .= "(?: $dtext | $quoted_pair )*"; // stuff
$domain_lit .= "$CloseBR"; // ]
// Item 9: sub-domain is a domain-ref or a domain-literal
$sub_domain = "";
$sub_domain .= "(?:";
$sub_domain .= "$domain_ref";
$sub_domain .= "|";
$sub_domain .= "$domain_lit";
$sub_domain .= ")";
$sub_domain .= "$X"; // optional trailing comments
// Item 6: domain is a list of subdomains separated by dots
$domain = "";
$domain .= "$sub_domain";
$domain .= "(?:";
$domain .= "$Period $X $sub_domain";
$domain .= ")*";
// Item 8: a route. A bunch of "@ $domain" separated by commas, followed by a colon.
$route = "";
$route .= "\@ $X $domain";
$route .= "(?: , $X \@ $X $domain )*"; // additional domains
$route .= ":";
$route .= "$X"; // optional trailing comments
// Item 5: local-part is a bunch of $word separated by periods
$local_part = "";
$local_part .= "$word $X";
$local_part .= "(?:";
$local_part .= "$Period $X $word $X"; // additional words
$local_part .= ")*";
// Item 2: addr-spec is local@domain
$addr_spec = "$local_part \@ $X $domain";
// Item 4: route-addr is <route? addr-spec>
$route_addr = "";
$route_addr .= "< $X";
$route_addr .= "(?: $route )?"; // optional route
$route_addr .= "$addr_spec"; // address spec
$route_addr .= ">";
// Item 3: phrase........
$phrase_ctrl = '\000-\010\012-\037'; // like ctrl, but without tab
// Like atom-char, but without listing space, and uses phrase_ctrl.
// Since the class is negated, this matches the same as atom-char plus space and tab
$phrase_char = "[^()<>\@,;:\".$esc$OpenBR$CloseBR$NonASCII$phrase_ctrl]";
// We've worked it so that $word, $comment, and $quoted_str to not consume trailing $X
// because we take care of it manually.
$phrase = "";
$phrase .= "$word"; // leading word
$phrase .= "$phrase_char *"; // "normal" atoms and/or spaces
$phrase .= "(?:";
$phrase .= "(?: $comment | $quoted_str )"; // "special" comment or quoted string
$phrase .= "$phrase_char *"; // more "normal"
$phrase .= ")*";
// Item 1: mailbox is an addr_spec or a phrase/route_addr
$mailbox = "";
$mailbox .= "$X"; // optional leading comment
$mailbox .= "(?:";
$mailbox .= "$addr_spec"; // address
$mailbox .= "|"; // or
$mailbox .= "$phrase $route_addr"; // name and address
$mailbox .= ")";
// test it and return results
$isValid = preg_match("/^$mailbox$/xS",$email);
return($isValid);
} // END validateEmailFormat
?>
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