Common regular rules for javascript form validation_javascript skills

Copy code The code is as follows:

/*
Purpose: Verify the format of the ip address
Input: strIP: ip address
Return: true if the verification is passed, otherwise false;
*/
function isIP(strIP) {
if (isNull(strIP)) return false;
var re = /^(d ).(d ).(d ).(d )$/g //Match IP Regular expression of address
if (re.test(strIP)) {
if (RegExp.$1 < 256 && RegExp.$2 < 256 && RegExp.$3 < 256 && RegExp.$4 < 256 ) return true;
}
return false;
}
/*
Purpose: Check whether the input string is empty or all spaces
Input: str
Return :
If all are empty, return true, otherwise return false
*/
function isNull(str) {
if (str == "") return true;
var regu = "^ [ ] $";
var re = new RegExp(regu);
return re.test(str);
}
/*
Purpose: Check whether the value of the input object conforms to an integer Format
Input: str Input string
Return: true if verified, otherwise false
*/
function isInteger(str) {
var regu = /^[-] {0,1}[0-9]{1,}$/;
return regu.test(str);
}
/*
Purpose: Check whether the entered mobile phone number is correct
Input:
s: String
Return:
Return true if verified, false otherwise
*/
function checkMobile(s) {
var regu = /^[ 1][0-9][0-9]{9}$/;
var re = new RegExp(regu);
if (re.test(s)) {
return true;
} else {
return false;
}
}
/*
Purpose: Check whether the input string conforms to the positive integer format
Input:
s: string
Returns:
Returns true if the verification is passed, otherwise returns false
*/
function isNumber(s) {
var regu = "^[0-9] $";
var re = new RegExp(regu);
if (s.search(re) != -1) {
return true;
} else {
return false;
}
}
/*
Purpose: Check whether the input string is in a numeric format with decimals, it can be a negative number
Input:
s: string
Return:
If the verification is passed Return true, otherwise return false
*/
function isDecimal(str) {
if (isInteger(str)) return true;
var re = /^[-]{0,1}( d )[.] (d )$/;
if (re.test(str)) {
if (RegExp.$1 == 0 && RegExp.$2 == 0) return false;
return true;
} else {
return false;
}
}
/*
Purpose: Check whether the value of the input object conforms to the port number format
Input: str input String
returns: true if verified, false otherwise
*/
function isPort(str) {
return (isNumber(str) && str < 65536);
}
/*
Purpose: Check whether the value of the input object conforms to the E-Mail format
Input: str input string
Return: if it passes the verification, it returns true, otherwise it returns false
*/
function isEmail(str) {
var myReg = /^[-_A-Za-z0-9] @([_A-Za-z0-9] .) [A-Za-z0-9]{ 2,3}$/;
if (myReg.test(str)) return true;
return false;
}
/*
Purpose: Check whether the input string conforms to the amount format
The format is defined as a positive number with decimals, up to three digits after the decimal point
Input:
s: string
Return:
If it passes verification, it returns true, otherwise it returns false
* /
function isMoney(s) {
var regu = "^[0-9] [.][0-9]{0,3}$";
var re = new RegExp(regu) ;
if (re.test(s)) {
return true;
} else {
return false;
}
}
/*
Usage: Check whether the input string only consists of English letters, numbers and underscores
Input:
s: string
Return:
If it passes the verification, it returns true, otherwise it returns false
*/
function isNumberOr_Letter(s) {//Determine whether it is a number or letter
var regu = "^[0-9a-zA-Z_] $";
var re = new RegExp(regu);
if (re.test(s)) {
return true;
} else {
return false;
}
}
/*
Purpose: Check input string Whether it consists of only English letters and numbers
Input:
s: String
Return:
Returns true if it passes verification, otherwise returns false
*/
function isNumberOrLetter(s) {//Determine whether it is a number or letter
var regu = "^[0-9a-zA-Z] $";
var re = new RegExp(regu);
if (re.test( s)) {
return true;
} else {
return false;
}
}
/*
Purpose: Check whether the input string only consists of Chinese characters and letters , composed of numbers
Input:
value: string
Return:
If it passes verification, it returns true, otherwise it returns false
*/
function isChinaOrNumbOrLett(s) {//Judge whether It is composed of Chinese characters, letters and numbers
var regu = "^[0-9a-zA-Zu4e00-u9fa5] $";
var re = new RegExp(regu);
if (re.test( s)) {
return true;
} else {
return false;
}
}
/*
Purpose: Determine whether it is a date
Input: date: date; fmt: date format
Return: return true if it passes verification, otherwise return false
*/
function isDate(date, fmt) {
if (fmt == null) fmt = "yyyyMMdd";
var yIndex = fmt.indexOf("yyyy");
if (yIndex == -1) return false;
var year = date.substring(yIndex, yIndex 4);
var mIndex = fmt.indexOf("MM");
if (mIndex == -1) return false;
var month = date.substring(mIndex, mIndex 2);
var dIndex = fmt.indexOf("dd");
if (dIndex == -1) return false;
var day = date. substring(dIndex, dIndex 2);
if (!isNumber(year) || year > "2100" || year < "1900") return false;
if (!isNumber(month) || month > "12" || month < "01") return false;
if (day > getMaxDay(year, month) || day < "01") return false;
return true;
}
function getMaxDay(year, month) {
if (month == 4 || month == 6 || month == 9 || month == 11)
return "30" ;
if (month == 2)
if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
return "29";
else
return "28";
return "31";
}
/*
Purpose: Whether character 1 ends with string 2
Input: str1: string; str2: The contained string
returns: true if verified, otherwise false
*/
function isLastMatch(str1, str2) {
var index = str1.lastIndexOf(str2);
if (str1.length == index str2.length) return true;
return false;
}
/*
Purpose: Whether character 1 starts with string 2
Input: str1 : String; str2: Contained string
Return: true if verified, otherwise false
*/
function isFirstMatch(str1, str2) {
var index = str1.indexOf (str2);
if (index == 0) return true;
return false;
}
/*
Purpose: Character 1 is the containing string 2
Input: str1 : String; str2: Contained string
Return: true if verified, otherwise false
*/
function isMatch(str1, str2) {
var index = str1.indexOf (str2);
if (index == -1) return false;
return true;
}
/*
Purpose: Check whether the entered start and end dates are correct, the rules are two The format of the date is correct,
and the end is as scheduled> = start date
Input:
startDate: start date, string
endDate: end as scheduled, string
Return:
Returns true if it passes validation, otherwise returns false
*/
function checkTwoDate(startDate, endDate) {
if (!isDate(startDate)) {
alert("The start date is incorrect! ");
return false;
} else if (!isDate(endDate)) {
alert("The end date is incorrect!");
return false;
} else if ( startDate > endDate) {
alert("The start date cannot be greater than the end date!");
return false;
}
return true;
}
/*
Purpose: Check whether the entered Email mailbox format is correct
Input:
strEmail: string
Return:
If it passes verification, it returns true, otherwise it returns false
*/
function checkEmail (strEmail) {
//var emailReg = /^[_a-z0-9] @([_a-z0-9] .) [a-z0-9]{2,3}$/;
var emailReg = /^[w-] (.[w-] )*@[w-] (.[w-] ) $/;
if (emailReg.test(strEmail)) {
return true ;
} else {
alert("The email address format you entered is incorrect! ");
return false;
}
}