//2011-11-27 星期日
//正则实战（2）：
Preg_match验证URL
$subscr=$_REQUEST['subscr']; //url validation
if (preg_match('|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i', $subscr)) { print "$subscr url OK."; } else { print "$subscr url not valid!"; } //echo("$subscr"); ?> 用ereg进行邮箱验证：
function validateMail($mail) { if($mail !== "") { if(ereg("^[-A-Za-z0-9_]+[-A-Za-z0-9_.]*[@]{1}[-A-Za-z0-9_]+[-A-Za-z0-9_.]*[.]{1}[A-Za-z]{2,5}$", $mail)) { return true; } else { return false; } } else { return false; } } ?> IP地址匹配验证：
function validateIpAddress($ip_addr) { //first of all the format of the ip address is matched if(preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/",$ip_addr)) { //now all the intger values are separated $parts=explode(".",$ip_addr); //now we need to check each part can range from 0-255 foreach($parts as $ip_parts) { if(intval($ip_parts)>255 || intval($ip_parts)<0) return false; //if number is not within range of 0-255 } return true; } else return false;  } UK 邮编验证：
function IsPostcode($postcode) { $postcode = strtoupper($postcode); if(ereg("((GIR 0AA)|(TDCU 1ZZ)|(ASCN 1ZZ)|(BIQQ 1ZZ)|(BBND 1ZZ)" ."|(FIQQ 1ZZ)|(PCRN 1ZZ)|(STHL 1ZZ)|(SIQQ 1ZZ)|(TKCA 1ZZ)" ."|[A-PR-UWYZ]([0-9]{1,2}|([A-HK-Y][0-9]" ."|[A-HK-Y][0-9]([0-9]|[ABEHMNPRV-Y]))" ."|[0-9][A-HJKS-UW]) [0-9][ABD-HJLNP-UW-Z]{2})", $postcode)) { return $postcode; } else { return FALSE; } } ?> SSN 和邮编验证：
function isValid($type,$var) { $valid = false; switch ($type) { case "IP": if (ereg('^([0-9]{1,3}\.){3}[0-9]{1,3}$',$var)) { $valid = true; } break; case “URL”: if (ereg("^[a-zA-Z0-9\-\.]+\.(com|org|net|mil|edu)$",$var)) { $valid = true; } break; case “SSN”: if (ereg("^[0-9]{3}[- ][0-9]{2}[- ][0-9]{4}|[0-9]{9}$",$var)) { $valid = true; } break; case “CC”: if (ereg("^([0-9]{4}[- ]){3}[0-9]{4}|[0-9]{16}$",$var)) { $valid = true; } break; case “ISBN”: if (ereg("^[0-9]{9}[[0-9]|X|x]$",$var)) { $valid = true; } break; case “Date”: if (ereg("^([0-9][0-2]|[0-9])\/([0-2][0-9]|3[01]|[0-9])\/[0-9]{4}|([0-9][0-2]|[0-9])-([0-2][0-9]|3[01]|[0-9])-[0-9]{4}$",$var)) { $valid = true; } break; case “Zip”: if (ereg("^[0-9]{5}(-[0-9]{4})?$",$var)) { $valid = true; } break; case "Phone": if (ereg("^((\([0-9]{3}\) ?)|([0-9]{3}-))?[0-9]{3}-[0-9]{4}$",$var)) { $valid = true; } break; case “HexColor”: if (ereg('^#?([a-f]|[A-F]|[0-9]){3}(([a-f]|[A-F]|[0-9]){3})?$',$var)) { $valid = true; } break; case “User”: if (ereg("^[a-zA-Z0-9_]{3,16}$",$var)) { $valid = true; } break; } return $valid; }