JavaScript regular expression verification code (recommended)

//Discern whether the input content is emptyfunction IsNull(){ 
var str = ('str').(); 
if(==0){ 
alert('Sorry, the text box cannot be empty or space!');//Please change the "text box" to the attribute name you need to verify!} 
} 
//Judge whether the date type is YYYY-MM-DD format typefunction IsDate(){ 
var str = ('str').(); 
if(!=0){ 
var reg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/; 
var r = (reg); 
if(r==null) 
alert('Sorry, the date you entered is incorrectly format!'); //Please change "date" to the attribute name you need to verify!} 
} 
//Judge whether the date type is YYYY-MM-DD hh:mm:ss format typefunction IsDateTime(){ 
var str = ('str').(); 
if(!=0){ 
var reg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/; 
var r = (reg); 
if(r==null) 
alert('Sorry, the date you entered is incorrectly format!'); //Please change "date" to the attribute name you need to verify!} 
} 
//Judge whether the date type is the type of hh:mm:ss formatfunction IsTime() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^((20|21|22|23|[0-1]\d)\:[0-5][0-9])(\:[0-5][0-9])?$/ 
if(!(str)){ 
alert("Sorry, the date you entered is incorrect!");//Please change "date" to the attribute name you need to verify!} 
} 
} 
//Discern whether the entered character is English letterfunction IsLetter() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^[a-zA-Z]+$/; 
if(!(str)){ 
alert("Sorry, the English letter type you entered is incorrect in the format!");//Please change "English letter type" to the attribute name you need to verify!} 
} 
} 
//Judge whether the entered character is an integerfunction IsInteger() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^[-+]?\d*$/; 
if(!(str)){ 
alert("Sorry, the integer type you entered is incorrect in the format!");//Please change the "integral type" to the attribute name you want to verify!} 
} 
} 
//Judge whether the input character is double precisionfunction IsDouble(val) 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^[-\+]?\d+(\.\d+)?$/; 
if(!(str)){ 
alert("Sorry, the double precision type you entered is incorrect in the format!");//Please change the "double precision type" to the attribute name you want to verify!} 
} 
} 
//Judge whether the input characters are: a-z, A-Z, 0-9function IsString() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^[a-zA-Z0-9_]+$/; 
if(!(str)){ 
alert("Sorry, the string type you entered is incorrect in the format!");//Please change the "string type" to the attribute name you want to verify!} 
} 
} 
//Judge whether the entered character is Chinesefunction IsChinese() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^[\u0391-\uFFE5]+$/; 
if(!(str)){ 
alert("Sorry, the string type you entered is incorrect in the format!");//Please change the "string type" to the attribute name you want to verify!} 
} 
} 
//Judge whether the input EMAIL format is correctfunction IsEmail() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/; 
if(!(str)){ 
alert("Sorry, the string type you entered is incorrect in the format!");//Please change the "string type" to the attribute name you want to verify!} 
} 
} 
//Judge whether the entered zip code (only six digits) is correctfunction IsZIP() 
{ 
var str = ('str').(); 
if(!=0){ 
reg=/^\d{6}$/; 
if(!(str)){ 
alert("Sorry, the string type you entered is incorrect in the format!");//Please change the "string type" to the attribute name you want to verify!} 
} 
} 
//Judge that the input number is not greater than a specific numberfunction MaxValue() 
{ 
var val = ('str').(); 
if(!=0){ 
reg=/^[-+]?\d*$/; 
if(!(str)){//Discern whether it is a numeric typeif(val>parseInt('123')) // "123" sets the maximum value for yourself{ 
alert('Sorry, the number you entered is out of range');//Please change the "number" to the attribute name you want to verify!} 
} 
} 
} 

// Provide the .trim() attribute for each JS verification method provided above.=function(){ 
return (/(^\s*)|(\s*$)/g, ""); 
}

<input type="text" name="str" >
<input type="button" value=" Sure " onClick=""> // Write the JS verification function you want to call in onClick<script language="javascript" type="text/javascript">
var patterms = new Object();
//Verify IP = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])(\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])){3}$/;
//Verify EMAIL = /^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
//Verify date format 2009-07-13 = /^\d{4}-(0?[1-9]|1[0-2])-(0?[1-9]|[1-2]\d|3[0-1])$/;
//Verification time format 16:55:39 = new RegExp("^([0-1]\\d|2[0-3]):[0-5]\\d:[0-5]\\d$");
//Verify functionfunction verify(str,pat)
{
var thePat;
thePat = patterms[pat];
if((str))
{
return true;
}
else
{
return false;
}
}
//testalert(verify("asidycom@","email")+","+verify("192.168.1.1","ip")+
","+verify("16:55:39","time")+","+verify("2009-07-13","date")+","+verify("192.168","ip"));

var regex = {
mobile: /^?([-]|[]|[]|[])[-]{}$/
}