JS Regular Expression Validation _ regular expression

Determines whether the input is an empty function IsNull () {var str = document.getElementById (' str '). Value.trim (); if (str.length==0) {alert (' Sorry, the text box cannot be empty or a space! '); 
/Please change the text box to the name of the property you want to verify! 
}//Determine if the date type is YYYY-MM-DD format type function IsDate () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {var reg =/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2})/; 
var r = Str.match (reg); if (r==null) alert (' Sorry, the date you entered is not in the correct format! '); 
Please change the "date" to the name of the property you want to verify! 
}//Determine if the date type is a type YYYY-MM-DD hh:mm:ss Format function isdatetime () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {var reg =/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2}) $/; 
var r = Str.match (reg); if (r==null) alert (' Sorry, the date you entered is not in the correct format! '); 
Please change the "date" to the name of the property you want to verify! 
}//Determine if the date type is HH:MM:SS format type function istime () {var str = document.getElementById (' str '). Value.trim (); if (str.length!=0) {reg=/^ (20|21|22|23|[ 0-1]\d) \:[0-5][0-9]) (\:[0-5][0-9])? $/if (!reg.test (str)) {alert ("Sorry, the date you entered is not in the correct format!"); /Please change the "date" to the name of the property you need to verifySaid! 
}}//Determine if the character entered is an English letter function isletter () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[a-za-z]+$/; if (!reg.test (str)) {alert ("Sorry, the English letter type you entered is not in the correct format!"); 
/Please change the "English letter type" to the name of the property you need to verify! 
}}//Determine if the character entered is an integer function Isinteger () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-+]?\d*$/; if (!reg.test (str)) {alert ("Sorry, the integer type you entered is not in the correct format!"); 
/Please replace "integer type" with the name of the property you want to verify! 
}}//Determine if the character entered is a double-precision function isdouble (val) {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-\+]?\d+ (\.\d+)? $/; if (!reg.test (str)) {alert ("Sorry, the Double-precision type you entered is not in the correct format!"); 
/Please replace "double type" with the name of the property you want to verify! 
}}//Determine if the character entered is: A-z,a-z,0-9 function isstring () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[a-za-z0-9_]+$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! }}//Determine if the character entered is Chinese function ischinese () {var str = Document.getelemenTbyid (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[\u0391-\uffe5]+$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
}//Determine if the email format entered is correct function isemail () {var str = document.getElementById (' str '). Value.trim (); if (str.length!=0) {reg=/^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] 
\w+) *$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
The correct function iszip () {var str = document.getElementById (' str ') is judged by the input ZIP code (only six digits). Value.trim (); 
if (str.length!=0) {reg=/^\d{6}$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
The number entered is not greater than a specific number function MaxValue () {var val = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-+]?\d*$/; if (!reg.test (str)) {//Judge whether the number type if (Val>parseint (' 123 '))//"123" sets the maximum value for itself {alert (' Sorry, the number you entered is out of range ');//Please add "number" 
Change to the name of the property you want to verify! Phone:/^ (\ (\d{2,3}\) | \d{3}\-))? (\ (0\d{2,3}\) |0\d{2,3}-)? [1-9]\d{6,7} (\-\d{1,4})?/; 
var r = Str.match (reg); if (r==null) alert (' Sorry, the date you entered is not in the correct format! '); 
Please change the "date" to the name of the property you want to verify! 
}//Determine if the date type is a type YYYY-MM-DD hh:mm:ss Format function isdatetime () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {var reg =/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2}) $/; 
var r = Str.match (reg); if (r==null) alert (' Sorry, the date you entered is not in the correct format! '); 
Please change the "date" to the name of the property you want to verify! 
}//Determine if the date type is HH:MM:SS format type function istime () {var str = document.getElementById (' str '). Value.trim (); if (str.length!=0) {reg=/^ (20|21|22|23|[ 0-1]\d) \:[0-5][0-9]) (\:[0-5][0-9])? $/if (!reg.test (str)) {alert ("Sorry, the date you entered is not in the correct format!"); 
/Please change the "date" to the name of the property you need to verify! 
}}//Determine if the character entered is an English letter function isletter () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[a-za-z]+$/; if (!reg.test (str)) {alert ("Sorry, the English letter type you entered is not in the correct format!"); 
/Please change the "English letter type" to the name of the property you need to verify! }}//Determine if the character entered is an integer function Isinteger () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-+]?\d*$/; if (!reg.test (str)) {alert ("Sorry, the integer type you entered is not in the correct format!"); 
/Please replace "integer type" with the name of the property you want to verify! 
}}//Determine if the character entered is a double-precision function isdouble (val) {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-\+]?\d+ (\.\d+)? $/; if (!reg.test (str)) {alert ("Sorry, the Double-precision type you entered is not in the correct format!"); 
/Please replace "double type" with the name of the property you want to verify! 
}}//Determine if the character entered is: A-z,a-z,0-9 function isstring () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[a-za-z0-9_]+$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! }}//Determine if the character entered is Chinese function ischinese () {var str = document.getElementById (' str '). Value.trim (); if (str.length!=0) {reg=/^[\u0391-\uffe5]+$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
}//Determine if the email format entered is correct function isemail () {var str = document.getElementById (' str '). Value.trim (); if (str.length!=0) {reg=/^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$/; if (!reg.tEST (str)) {alert ("Sorry, the string type you typed is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
The correct function iszip () {var str = document.getElementById (' str ') is judged by the input ZIP code (only six digits). Value.trim (); 
if (str.length!=0) {reg=/^\d{6}$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
The number entered is not greater than a specific number function MaxValue () {var val = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-+]?\d*$/; if (!reg.test (str)) {//Judge whether the number type if (Val>parseint (' 123 '))//"123" sets the maximum value for itself {alert (' Sorry, the number you entered is out of range ');//Please add "number" 
Change to the name of the property you want to verify! Phone:/^ (\ (\d{2,3}\) | \d{3}\-))? (\ (0\d{2,3}\) |0\d{2,3}-)? [1-9]\d{6,7} (\-\d{1,4})?/Mobile:/^ ((\d2,3\d2,3) | ( \d{3}\-))? 13\d{9}/url:/http:\/\/[a−za−z0−9]+\. [a−za−z0−9]+[\/=\?/url:/http:\/\/[a−za−z0−9]+\.[  a−za−z0−9]+[\/=\?/Idcard:/^\d{15} (\d{2}[a-za-z0-9)?/qq:/[1−9]\d4,8/qq:/[1−9]\d4,8/

A special Amount:/^ ((\d{1,3} (, \d{3}) *) | ( \d+)) (\.\d{2})? $/

Note: In addition to the "XXX xx,xxx xx,xxx.00" format
for the above provide each JS verification method provided. Trim () property 
string.prototype.trim=function () {return 
This.replace (/(^\s*) | ( \s*$)/g, ""); 

Call:

<input type= "text" name= "str" >
<input type= "button" value= "OK" onclick= "" >//onclick write the JS validation function you want to call

The above is a small set to introduce the JS regular expression of the verification, I hope to help you, if you have any questions welcome to my message, small series will promptly reply to everyone!