Edi Weitz, a free-lance consultant and application developer in Hamburg, Germany, has created a very helpful tool named Regexp Coach. This program will coach you through PCRE. http://www.weitz.de/regex-coach/ Regards, León van de Pavert On Fri, 7 May 2004 16:03:49 +0100 (BST), Jonathan Heaton <jonathanheaton@yahoo.co.uk> wrote: > I'm a recent convert to PHP and I hope to use this > script. I have used the Unix utilities sed, grep and > awk a number of times. There is an art to pattern > matching and regular expressions. > > Thanks > > Jonathan Heaton > > --- León_van_de_Pavert > <leon.vandepavert@yritysrekisteri.com> wrote: > LS, >> >> The RE >> "^[a-zA-Z\.\-_]+@([a-zA-Z\.\-_]+\.)+[a-zA-Z]{2,4}$", >> used by >> latifcom@yahoo.com will validate "name@domain.xxxx" >> even though that TLD >> does not exist and it will not validate >> name2004@domain.com, even though >> it is a very valid email address. >> >> An email can be of the following forms, before the @ >> sign : >> >> name >> firstname.lastname >> firstname.middlename.lastname >> etc. >> >> and after the @ sign : >> >> domain.tld >> sub.domain.tld >> sub1.sub2.domain.tld >> etc. >> >> Several characters are not allowed at certain >> places. I use this PCRE with >> preg_match : >> > "/^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,})$/si" >> >> http://php.net/manual/en/function.ereg.php says >> "Note: preg_match(), which >> uses a Perl-compatible regular expression syntax, is >> often a faster >> alternative to ereg()." >> >> I tend to agree when validating a large number of >> emails from database. >> >> IANA has lists of all Top Level Domains that are >> allowed at >> http://www.iana.org/domain-names.htm but the only >> way to be absolutely >> sure an email address exists is to check and ask the >> mail server. >> >> /* START OF CODE */ >> <?php >> // validates email. IDN is NOT taken into >> consideration yet. >> >> function validate_mail($Email) { >> global $HTTP_HOST; >> $result = array(); >> $Pattern = >> > "/^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,})$/si"; >> if (!preg_match($Pattern, $Email)) { >> $result[0]=false; >> $result[1]="$Email is not properly formatted (IDN >> is not supported >> yet)."; >> return $result; >> } >> list ( $Username, $Domain ) = split ("@",$Email); >> if (getmxrr($Domain, $MXHost)) { >> $ConnectAddress = $MXHost[0]; >> } else { >> $ConnectAddress = $Domain; >> } >> $Connect = @fsockopen($ConnectAddress, 25); >> if ($Connect) { >> if (ereg("^220", $Out = fgets($Connect, 1024))) { >> fputs($Connect, "HELO $HTTP_HOST\r\n"); >> $Out = fgets($Connect, 1024); >> fputs($Connect, "MAIL FROM: <{$Email}>\r\n"); >> $From = fgets($Connect, 1024); >> fputs($Connect, "RCPT TO: <{$Email}>\r\n"); >> $To = fgets($Connect, 1024); >> fputs ($Connect, "QUIT\r\n"); >> fclose($Connect); >> $result[2] = $Out; >> $result[3] = $From; >> $result[4] = $To; >> $result[5] = $Domain; >> $result[6] = $MXHost[0]; >> >> if (!ereg("^250", $From) || !ereg ("^250", $To)) >> { >> $result[0] = false; >> $result[1] = "Server rejected address.\n"; >> return $result; >> } >> } else { >> $result[0] = false; >> $result[1] = "No response from server.\n"; >> return $result; >> } >> } else { >> $result[0] = false; >> $result[1] = "Can not connect E-Mail server.\n"; >> return $result; >> } >> $result[0] = true; >> $result[1] = "Email address appears to be >> valid.\n"; >> return $result; >> } >> >> if ($_GET) { >> $email = $_GET['email']; >> } else if ($_POST) { >> $email = $_POST['email']; >> } else { >> echo "no email address to validate"; >> exit(); >> } >> >> // IANA Country Code Top-Level Domains >> $_CCTLD = array("ac", "ad", "ae", "af", "ag", "ai", >> "al", "am", "an", >> "ao", "aq", "ar", "as", "at", "au", "aw", "az", >> "ba", "bb", "bd", "be", >> "bf", "bg", "bh", "bi", "bj", "bm", "bn", "bo", >> "br", "bs", "bt", "bv", >> "bw", "by", "bz", "ca", "cc", "cd", "cf", "cg", >> "ch", "ci", "ck", "cl", >> "cm", "cn", "co", "cr", "cu", "cv", "cx", "cy", >> "cz", "de", "dj", "dk", >> "dm", "do", "dz", "ec", "ee", "eg", "eh", "er", >> "es", "et", "fi", "fj", >> "fk", "fm", "fo", "fr", "ga", "gd", "ge", "gf", >> "gg", "gh", "gi", "gl", >> "gm", "gn", "gp", "gq", "gr", "gs", "gt", "gu", >> "gw", "gy", "hk", "hm", >> "hn", "hr", "ht", "hu", "id", "ie", "il", "im", >> "in", "io", "iq", "ir", >> "is", "it", "je", "jm", "jo", "jp", "ke", "kg", >> "kh", "ki", "km", "kn", >> "kp", "kr", "kw", "ky", "kz", "la", "lb", "lc", >> "li", "lk", "lr", "ls", >> "lt", "lu", "lv", "ly", "ma", "mc", "md", "mg", >> "mh", "mk", "ml", "mm", >> "mn", "mo", "mp", "mq", "mr", "ms", "mt", "mu", >> "mv", "mw", "mx", "my", >> "mz", "na", "nc", "ne", "nf", "ng", "ni", "nl", >> "no", "np", "nr", "nu", >> "nz", "om", "pa", "pe", "pf", "pg", "ph", "pk", >> "pl", "pm", "pn", "pr", >> "ps", "pt", "pw", "py", "qa", "re", "ro", "ru", >> "rw", "sa", "sb", "sc", >> "sd", "se", "sg", "sh", "si", "sj", "sk", "sl", >> "sm", "sn", "so", "sr", >> "st", "sv", "sy", "sz", "tc", "td", "tf", "tg", >> "th", "tj", "tk", "tm", >> "tn", "to", "tp", "tr", "tt", "tv", "tw", "tz", >> "ua", "ug", "uk", "um", >> "us", "uy", "uz", "va", "vc", "ve", "vg", "vi", >> "vn", "vu", "wf", "ws", >> "ye", "yt", "yu", "za", "zm", "zw"); >> >> // IANA Top-Level Domains >> $_TLD = array("aero", "biz", "com", "coop", "edu", >> "gov", "info", "int", >> "mil", "museum", "name", "net", "org", "pro"); >> >> // Cut the email address in pieces at the . (dot) >> $tld = explode(".",$email); >> >> // Reverse the array. Now the first element is the >> TLD we're going to >> check. >> $tld = array_reverse($tld); >> >> // init >> $answer = array(); >> >> if (in_array($tld[0],$_CCTLD) || >> in_array($tld[0],$_TLD) ) { >> // valid TLD >> $answer = validate_mail($email); >> if ($answer[0] === true) { >> // email validates >> } else { >> // email rejected. >> } >> } else { >> // invalid TLD >> $answer[0] = false; >> $answer[1] = "TLD .{$tld[0]} does not exist. >> Please enter a valid email >> address."; >> } >> ?> >> <html> >> <head> >> <title>validate_email.php?email=</title> >> <meta http-equiv="Content-Type" >> content="text/html; charset=utf-8" /> >> </head> >> <body> >> > === message truncated === > > > > > > ____________________________________________________________ > Yahoo! Messenger - Communicate instantly..."Ping" > your friends today! 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