PHP common Form Validation Regular expression _ regular expression

function Is_email ($STR) {
Check Email
Return Preg_match ("/^\w+ [-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$/", $str);
}

function Is_url ($STR) {
Check the Web site
Return Preg_match ("/^http:\/\/[a-za-z0-9]+\.[ a-za-z0-9]+[\/=\?%\ -&_~ ' @[\]\ ': +!] * ([^<>\ "])

*$/", $STR);
}

function Is_qq ($STR) {

Test QQ
Return Preg_match ("/^[1-9]\d{4,8}$/", $str);
}

function Is_zip ($STR) {

Inspection ZIP Code
Return Preg_match ("/^[1-9]\d{5}$/", $str);
}

function Is_idcard ($STR) {

Test ID
Return Preg_match ("/^\d{15} (\d{2}[a-za-z0-9])" $/", $str);
}

function Is_chinese ($STR) {

Test whether it is Chinese
Return Ereg ("^[". Chr (0XA1). " -". Chr (0xFF)."] +$ ", $STR);
}

function Is_english ($STR) {

Whether the test is English
Return Preg_match ("/^[a-za-z]+$/", $str);
}

function Is_mobile ($STR) {

Check if it's a cell phone.
Return Preg_match (/^ (\d{3}\) | ( \d{3}\-))? 13\d{9}$/", $STR);
}

function Is_phone ($STR) {

Jianyun, is that a phone call?
Return Preg_match (/^ (\d{3}\) | ( \d{3}\-))? (\ (0\d{2,3}\) |0\d{2,3}-)? [1-9]\d{6,7}$/",

$STR);
}

function Is_safe ($STR) {
Return (Preg_match ("/^" ([a-z]*|[ a-z]*|\d*| [-_\~!@#\$%\^&\*\.\ (\) \[\]\{\}<>\?\\\/\ ' \ "]*) |.

{0,5}) $|\s/", $str)!= 0);
}
}