JS verification of Regular Expressions

/Determine whether the input content is empty
Function isnull (){
VaR STR = Document. getelementbyid ('str'). value. Trim ();
If (Str. Length = 0 ){
Alert ('Sorry, the text box cannot be blank or blank! '); // Change the "text box" to the attribute name you want to verify!
}
}

// Determine whether the date type is a type in YYYY-MM-DD format
Function isdate (){
VaR STR = Document. getelementbyid ('str'). value. Trim ();
If (Str. length! = 0 ){
VaR Reg =/^ (\ D {}) (-| \/) (\ D {}) \ 2 (\ D {}) $ /;
VaR r = Str. Match (REG );
If (r = NULL)
Alert ('Sorry, the date format you entered is incorrect! '); // Change "date" to the name of the property to be verified!
}
}

// Determine whether the date type is YYYY-MM-DD hh: mm: SS type
Function isdatetime (){
VaR STR = Document. getelementbyid ('str'). value. Trim ();
If (Str. length! = 0 ){
VaR Reg =/^ (\ D {}) (-| \/) (\ D {}) \ 2 (\ D }) (\ D {1, 2}) :( \ D {1, 2}) :( \ D {1, 2}) $ /;
VaR r = Str. Match (REG );
If (r = NULL)
Alert ('Sorry, the date format you entered is incorrect! '); // Change "date" to the name of the property to be verified!
}
}

// Determine whether the date type is in HH: mm: SS format
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 format you entered is incorrect! "); // Change" date "to the attribute name you want to verify!
}
}
}

// Determine whether the entered character 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 format you entered is incorrect! "); // Change" English letter type "to the attribute name you want to verify!
}
}
}

// Determine whether the input character 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 format of the integer type you entered is incorrect! "); // Replace" Integer type "with the property name you want to verify!
}
}
}

// Determine whether the input character is 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 format of the Double Precision type you entered is incorrect! "); // Replace" double-precision type "with the property name you want to verify!
}
}
}


// Determine whether the input character 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 format of the string type you entered is incorrect! "); // Replace" string type "with the property name you want to verify!
}
}
}

// Determine whether the input character 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 format of the string type you entered is incorrect! "); // Replace" string type "with the property name you want to verify!
}
}
}

// Determine whether the input email format 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 format of the string type you entered is incorrect! "); // Replace" string type "with the property name you want to verify!
}
}
}

// Determine whether the entered zip code (only six digits can be entered) is correct
Function iszip ()
{
VaR STR = Document. getelementbyid ('str'). value. Trim ();
If (Str. length! = 0 ){
Reg =/^ \ D {6} $ /;
If (! Reg. Test (STR )){
Alert ("sorry, the format of the string type you entered is incorrect! "); // Replace" string type "with the property name you want to verify!
}
}
}

// Judge whether the input number is greater than a specific number.
Function maxvalue ()
{
Var val = Document. getelementbyid ('str'). value. Trim ();
If (Str. length! = 0 ){
Reg =/^ [-+]? \ D * $ /;
If (! Reg. Test (STR) {// determines whether the data type is Numeric.
If (Val> parseint ('000000') // "123" is the maximum value you set.
{
Alert ('Sorry, the number you entered is out of range '); // change "Number" to the attribute name 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:/^ (\ D {2, 3} \) | (\ D {3 }\-))? 13 \ D {9} $/
URL:/^ http: \/[A-Za-z0-9] + \. [A-Za-z0-9] + [\/= \? % \-&_~ '@ [\] \': +!] * ([^ <> \ "\"]) * $/
Idcard:/^ \ D {15} (\ D {2} [A-Za-z0-9])? $/
QQ:/^ [1-9] \ D {4, 8} $/
A special amount:/^ (\ D {1, 3} (, \ D {3}) *) | (\ D +) (\. \ D {2 })? $ // Description: Except for the format "xxx xx, xxx XX, xxx.00"

// Provide. Trim () attributes for each JS verification method provided above
String. Prototype. Trim = function (){
Return this. Replace (/(^ \ s *) | (\ s * $)/g ,"");
}

Call:
<Input type = "text" name = "str">
<Input type = "button" value = "OK" onclick = ""> // write the JS verification function to be called in onclick.