Some common Javascript Detection Functions

// Function Name: trim
// Function Description: removes spaces at the beginning and end of a string.
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String. prototype. trim = function (){
Return this. replace (/(^ \ s *) | (\ s * $)/g ,"");
}



// Function Name: ltrim
// Function Description: removes spaces on the left of the string.
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String. prototype. ltrim = function ()
{
Return this. replace (/(^ \ s *)/g ,"");
}

// Function Name: rtrim
// Function Description: removes spaces on the right of the string.
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String. prototype. rtrim = function ()
{
Return this. replace (/(\ s * $)/g ,"");
}

// Function Name: len
// Function Description: returns the actual length of the string. One Chinese character is counted as two lengths.
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String. prototype. len = function ()
{
Var str = this;
Return str. replace (/[^ \ x00-\ xff]/g, "**"). length
}

// Function Name: isValidDate
// Function Description: determines whether the input is a valid short date format-"YYYY-MM-DD"
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String. prototype. isValidDate = function ()
{
Var result = this. match (/^ (\ d {}) (-| \/) (\ d {}) \ 2 (\ d {}) $ /);
If (result = null) return false;
Var d = new Date (result [1], result [3]-1, result [4]);
Return (d. getFullYear () = result [1] & d. getMonth () + 1 = result [3] & d. getDate () = result [4]);
}

// Function Name: isValidTime
// Function Description: determines whether the input is in a valid time format-"HH: MM: SS"
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String. prototype. isValidTime = function ()
{
Var resule = this. match (/^ (\ d {1, 2 })(:)? (\ D {1, 2}) \ 2 (\ d {1, 2}) $ /);
If (result = null) return false;
If (result [1]> 24 | result [3]> 60 | result [4]> 60) return false;
Return true;
}

// Function Name: isValidEmail
// Function Description: determines whether the input is a valid email.
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String. prototype. isValidEmail = function ()
{
Var result = this. match (/^ \ w + (-\ w +) | (\. \ w +) * \ @ [A-Za-z0-9] + ((\. |-) [A-Za-z0-9] + )*\. [A-Za-z0-9] + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidDatetime
// Function Description: determines whether the input is a valid long date format-"YYYY-MM-DD HH: MM: SS"
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String. prototype. isValidDatetime = function ()
{
Var result = this. match (/^ (\ d {}) (-| \/) (\ d {}) \ 2 (\ d }) :( \ d {1, 2}) :( \ d {1, 2}) $ /);
If (result = null) return false;
Var d = new Date (result [1], result [3]-1, result [4], result [5], result [6], result [7]);
Return (d. getFullYear () = result [1] & (d. getMonth () + 1) = result [3] & d. getDate () = result [4] & d. getHours () = result [5] & d. getMinutes () = result [6] & d. getSeconds () = result [7]);
}

// Function Name: isValidInteger
// Function Description: determines whether the input is an integer.
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String. prototype. isValidInteger = function ()
{
Var result = this. match (/^ (-| \ + )? \ D + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidPositiveInteger
// Function Description: determines whether the input is a positive integer.
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String. prototype. isValidPositiveInteger = function ()
{
Var result = this. match (/^ \ d + $ /);
If (result = null) return false;
If (parseInt (this)> 0) return true;
Return false;
}

// Function Name: isValidNegativeInteger
// Function Description: determines whether the input is a negative integer.
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String. prototype. isValidNegativeInteger = function ()
{
Var result = this. match (/^-\ d + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidNumber
// Function Description: determines whether the input is a number.
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String. prototype. isValidNumber = function ()
{
Return! IsNaN (this );
}

// Function Name: isValidLetters
// Function Description: determines whether the input is a string consisting of A-Z/a-z
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String. prototype. isValidLetters = function ()
{
Var result = this. match (/^ [a-zA-Z] + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidDigits
// Function Description: determines whether the input is a number consisting of 0-9.
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String. prototype. isValidDigits = function ()
{
Var result = this. match (/^ [1-9] [0-9] + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidAlphanumeric
// Function Description: determines whether the input is a string consisting of 0-9/A-Z/a-z
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String. prototype. isValidAlphanumeric = function ()
{
Var result = this. match (/^ [a-zA-Z0-9] + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidString
// Function Description: determines whether the input is a string consisting of 0-9/A-Z/a-z /./_
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String. prototype. isValidString = function ()
{
Var result = this. match (/^ [a-zA-Z0-9 \ s. \-_] + $ /);
If (result = null) return false;
Return true;
}

// Function Name: isValidPostalcode
// Function Description: determines whether the input is a valid zip code.
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String. prototype. isValidPostalcode = function ()
{
Var result = this. match (/(^ [0-9] {6} $ )/);
If (result = null) return false;
Return true;
}

// Function Name: isValidPhoneNo
// Function Description: determines whether the input is a valid phone number.
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String. prototype. isValidPhoneNo = function ()
{
Var result = this. match (/(^ [0-9] {3, 4} \-[0-9] {3, 8} $) | (^ [0-9] {3, 8} $) | (^ \ ([0-9] {3, 4} \) [0-9] {3, 8} $ )/);
If (result = null) return false;
Return true;
}

// Function Name: isValidMobileNo
// Function Description: determines whether the input is a valid mobile phone number.
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String. prototype. isValidMobileNo = function ()
{
Var result = this. match (/(^ 0 {0, 1} 13 [0-9] {9} $ )/);
If (result = null) return false;
Return true;
}