JS Regular expressions and validation time Regular expressions _ regular expressions

In this article, I've written 12 very useful regular expressions, which is a favorite of web developers.

1. In the input box can only enter the amount, in fact, can only enter a maximum of two decimal digits//The first type in input box limit

<input type= "Text" maxlength= "8" class= "Form-control" id= "Amount" "style=" margin-right:2px "value=" "onchange=" Count (); "onkeyup=" if (this.value==this.value2) return; if (This.value.search/^\d* (?: \. \d{0,2}) $/) ==-1) this.value= (this.value2) this.value2: "; else this.value2=this.value;" >
//The second way to add dynamic forms to a form is only validated in the JS method.
var amount=$ ("#amount"). Val ();
if (Amount.search/^\d* (?: \. \d{0,2}) ($/) ==-1) {
alert ("The amount is not formatted, up to two decimal places");
return false;
}

2. Verify the mailbox format

var reg=/\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) * * *;
var email=$ ("#email"). Val ();
if (!reg.test (email)) {
alert ("Please enter the mailbox account that complies with the specification!") ");
return false;
}

3. The password uses the numeral, the letter, the special character and the length is 8-20 bits

function Validatepwd (str) {
if (/^.*?[ \d]+.*$/.test (str) &&/^.*? [A-za-z]/.test (str)
&&/^.*?[ ~/'!@#$%^&* () _+| {}?;:><\-\]\\[\/].*$/.test (str) &&/^. {8,20}$/.test (str)) {return
true;
}
return false;
}

4. Verify Telephone number

/**
* Verify phone number *
@param phonevalue number to verify
* @returns match returns True mismatch return false/
function Validatephone (phonevalue) {
phonevalue = Valuetrim (phonevalue);
var reg =/^[1][0-9]{10}$/;
Return Reg.test (Phonevalue);
}

5. Judge whether it is Chinese characters

/**
* Judge whether it is Chinese characters
*
* @param charvalue
* To validate the data
* @returns match returns true mismatch return
false
* * * function Ischaracter (charvalue) {
var reg =/^[\u4e00-\u9fa5]{0,}$/;
Return Reg.test (charvalue);
}

6. Is the letter: true: Yes, false: No

function Ischar (charvalue) {
var charpattern=/^[a-za-z]*$/;//is the letter
result=charpattern.test (charvalue);
return result;
}

7. Determining whether a number

function Isnum (numvalue) {
var numpattern=/^\d*$/;//number Regular expression
result=numpattern.test (NumValue);
return result;
}

8. The regular expression of an integer

function Isint (intvalue) {
var intpattern=/^0$|^[1-9]\d*$/;//integer Regular expression
result=intpattern.test (intvalue);
return result;
}

9. Letters and Numbers

function Ischarnum (flagvalue) {
var flagpattern=/^[a-za-z0-9]*$/;//is a letter and number
result=flagpattern.test ( Flagvalue);
return result;
}

10. Test 18 ID Number

/**
* Test 18 ID Number (15 digits can only detect the birthday is correct, self-resolved)
* *
@param idcardvalue
* 18 ID Card number
* @returns match returns True  Mismatch return false
/function idcardvildate (CID) {
var arrexp = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];//weighted factor
var arrvalid = [1, 0, "X", 9, 8, 7, 6, 5, 4, 3, 2];//check code
var reg =/^[1-9]\d{5}[1-9]\d{3} ((0\d) | ( 1[0-2])) (([0|1|2]\d) |3[0-1]) \d{3} ([0-9]| X) $/;
if (Reg.test (CID)) {
var sum = 0, idx;
for (var i = 0; i < cid.length-1 i++) {
//pair of first 17 digits with weight product sum
sum + = parseint (Cid.substr (i, 1), ten) * arrexp[i ];
}
Computational modulus (fixed algorithm)
idx = sum%;
Check whether the 18th is equal to check code return
Arrvalid[idx] = = CID.SUBSTR (1). toUpperCase ();
else {return
false;
}
}

11. Verify that the birthday in the 15-digit ID number is a valid birthday

function Isvaliditybrithby15idcard (idCard15) {
var year = idcard15.substring (6, 8);
var month = idcard15.substring (8);
var day = idcard15.substring (a);
var temp_date = new Date (year, parsefloat (month)-1, parsefloat (day));
The age of your old ID card does not need to consider the millennium bug problem and use the getyear () method
if (Temp_date.getyear ()!= parsefloat (year)
| | temp_date.getmonth ()! = parsefloat (month)-1
| | | temp_date.getdate ()!= parsefloat (day) {return
false;
} else {return
true ;
}
}

12. Verify that the birthday in the 18-digit ID number is a valid birthday

function Isvaliditybrithby18idcard (idCard18) {
var year = idcard18.substring (6);
var month = idcard18.substring (a);
var day = idcard18.substring (a);
var temp_date = new Date (year, parsefloat (month)-1, parsefloat (day));
Here use getFullYear () to get the year to avoid the bug problem
if (temp_date.getfullyear ()!= parsefloat ()
| | temp_date.getmonth ()!= Parsefloat (month)-1
| | | temp_date.getdate ()!= parsefloat (day)) {return
false;
} else {return
true;
}
}

PS:JS validation-time Regular expression

The validation time format is: 2012-01-31 09:00:22

var redatetime =/^ (?: 19|20) [0-9][0-9]-(?:(?: 0 [1-9]) | (?: 1[0-2]) -(:(?: [0-2][1-9]) | (?: [1-3][0-1]) (:(?: [0-2][0-3]) | (?: [0-1][0-9]): [0-5][0-9]:[0-5][0-9]$/;
var isdatetime = redatetime.test (' 2012-01-31 09:00:22 ');

The above mentioned is a small set of JS commonly used regular expressions and verification of the regular expression of time, I hope to help everyone, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!