JavaScript-Common Regular expression code

Web page Special effects common regular expression code

Html

<p>
<label for= "Mobile_phone" > Mobile </label>
<input type= "text" id= "Mobile_phone", name= "Mobile_phone" value= "15107105287"/>
<input type= "button" value= "Validate" onclick= "IsMobile ()"/>
</p>
<p>
<label for= "Phone" > Landline </label>
<input type= "text" id= "phone" name= "Phone" value= "027-87767676"/>
<input type= "button" value= "Validate" onclick= "Isphone ()"/>
</p>
<p>
<label for= "Email" > Email </label>
<input type= "" id= "email" name= "email" value= "zhangchen2397@126.com"/>
<input type= "button" value= "Validate" onclick= "Isemail ()"/>
</p>

Js

function IsMobile () {
var mobile = document.getElementById ("Mobile_phone");
var num = Mobile.value;
var reg =/^ (13[0-9]|186|188|150|151|158|159|147) d{8}$/;
if (num = "") {
Alert ("Please enter full cell phone number");
Mobile.focus ();
return false;
else if (reg.test (num)) {
Alert ("Input cell phone number is in the correct format");
} else {
Alert ("Please enter the correct 11-digit mobile phone number");
Mobile.focus ();
return false;
}
}
function Isemail () {
var email = document.getElementById ("email");
var email_value = Email.value;
if (Email_value = = "") {
Alert ("Please enter a Full mailbox");
Email.focus ();
return false;
} else {
var reg =/^[a-za-z0-9] (w) +@ (W) + (.) + (com|com.cn|net|cn|net.cn|org|biz|info|gov|gov.cn|edu|edu.cn) $/;
if (Reg.test (Email_value)) {
Alert ("Input mailbox format is correct");
} else {
Alert ("Please enter the correct mailbox format");
Email.focus ();
return false;
}
}
}
function Isphone () {
var phone = document.getElementById ("Phone");
var phone_value = Phone.value;
if (Phone_value = = "") {
Alert ("Please enter full landline number");
Phone.focus ();
return false;
} else {
var reg =/^[(]?0d{2,3}[)]?s*[-]?s*d{7,8}$/; 010-87989898 01098989898 (0712) 8989898 010-23343434 The landline numbers for these formats are met
if (Reg.test (Phone_value)) {
Alert ("Input landline number is correct");
} else {
Alert ("Input landline number format error");
Phone.focus ();
return false;
}
}
}

Common regular

•. finds a single character, except for newline and line terminator;
W matches symbols such as letters, Chinese characters, numbers, underscores,
s matching whitespace (including spaces, tabs, and so on),
D matches numbers,
B matches at the beginning or end of a word, and
often The quantifiers used are:
^n matches any string that starts with N,
n$ matches any string that has a trailing n,
n+ matches any string containing at least one n,
n* matches any string containing 0 or more n;
N? Matches any string containing 0 or one n, the
n{x} matches a string containing a sequence of x N,
n{x, and Y} matches a string containing a sequence of x or y n;
Simple example, primarily used to verify mobile phone numbers, phone numbers, and mailboxes: