JavaScript Regular expression validation code (recommended) _ Regular expression

REGEXP: is shorthand for regular expressions (regular expression).

A regular expression describes the pattern object of a character. You can use regular expressions to describe what you want to retrieve.

A simple pattern can be a single character. More complex patterns include more characters and can be used for parsing, format checking, substitution, and more.

Determines whether the input is an empty function IsNull () {var str = document.getElementById (' str '). Value.trim (); if (str.length==0) {alert (' Sorry, the text box cannot be empty or a space! '); 
/Please change the text box to the name of the property you want to verify! 
}//Determine if the date type is YYYY-MM-DD format type function IsDate () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {var reg =/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) $/; 
var r = Str.match (reg); if (r==null) alert (' Sorry, the date you entered is not in the correct format! '); 
Please change the "date" to the name of the property you want to verify! 
}//Determine if the date type is a type YYYY-MM-DD hh:mm:ss Format function isdatetime () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {var reg =/^ (\d{1,4}) (-|\/) (\d{1,2}) \2 (\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2}) $/; 
var r = Str.match (reg); if (r==null) alert (' Sorry, the date you entered is not in the correct format! '); 
Please change the "date" to the name of the property you want to verify! 
}//Determine if the date type is HH:MM:SS format type 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])? $/if (!reg.test (str)) {alert ("Sorry, the date you entered is not in the correct format!"); /Please change "date" to the attribute you need to verifyName! 
}}//Determine if the character entered is an English letter function isletter () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[a-za-z]+$/; if (!reg.test (str)) {alert ("Sorry, the English letter type you entered is not in the correct format!"); 
/Please change the "English letter type" to the name of the property you need to verify! 
}}//Determine if the character entered 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 integer type you entered is not in the correct format!"); 
/Please replace "integer type" with the name of the property you want to verify! 
}}//Determine if the character entered is a double-precision function isdouble (val) {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-\+]?\d+ (\.\d+)? $/; if (!reg.test (str)) {alert ("Sorry, the Double-precision type you entered is not in the correct format!"); 
/Please replace "double type" with the name of the property you want to verify! 
}}//Determine if the character entered is: A-z,a-z,0-9 function isstring () {var str = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[a-za-z0-9_]+$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! }}//Determine if the character entered is Chinese function ischinese () {var str = Document.getelemeNtbyid (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[\u0391-\uffe5]+$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
}//Determine if the email format entered is correct function isemail () {var str = document.getElementById (' str '). Value.trim (); if (str.length!=0) {reg=/^\w+ ([-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] 
\w+) *$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
The correct function iszip () {var str = document.getElementById (' str ') is judged by the input ZIP code (only six digits). Value.trim (); 
if (str.length!=0) {reg=/^\d{6}$/; if (!reg.test (str)) {alert ("Sorry, the string type you entered is not well-formed!"); 
/Please replace "string type" with the name of the property you want to verify! 
The number entered is not greater than a specific number function MaxValue () {var val = document.getElementById (' str '). Value.trim (); 
if (str.length!=0) {reg=/^[-+]?\d*$/; if (!reg.test (str)) {//Judge whether the number type if (Val>parseint (' 123 '))//"123" sets the maximum value for itself {alert (' Sorry, the number you entered is out of range ');//Please add "number" 
Change to the name of the property 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: In addition to the "XXX xx,xxx xx,xxx.00" format

Provide each JS verification method above. Trim () property 
string.prototype.trim=function () {return 
this.replace (/^\s*) | ( \s*$)/g, ""); 

Call:

<input type= "text" name= "str" >
<input type= "button" value= "OK" onclick= "" >//onclick write their own JS validation function to call C2/><script language= "javascript" type= "Text/javascript" >
var patterms = new Object ();
Verify IP
patterms.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}$/;
Verify email
patterms.email =/^[a-za-z0-9_-]+@[a-za-z0-9_-]+ (\.[ a-za-z0-9_-]+) +$/;
Validate date format 2009-07-13
patterms.date =/^\d{4}-(0?[ 1-9]|1[0-2])-(0?[ 1-9]| [1-2]\d|3[0-1]) $/;
Validation time format 16:55:39
patterms.time = new RegExp ("^ ([0-1]\\d|2[0-3]): [0-5]\\d:[0-5]\\d$");
Validation function
Verify (STR,PAT)
{
var thepat;
Thepat = Patterms[pat];
if (Thepat.test (str))
{return
true;
}
else
{return
false;
}
}
Test
alert (Verify ("asidycom@163.com", "email") + "," +verify ("192.168.1.1", "IP") +
"," +verify ("16:55:39", "Time") + "," +verify ("2009-07-13", "date") + "," +verify ("192.168", "IP"));

Verify Number: ^[0-9]*$

Verify the N-bit number: ^\d{n}$

Verify at least n digits: ^\d{n,}$

Verify the number of m-n bits: ^\d{m,n}$

Verify numbers beginning with 0 and non 0: ^ (0|[ 1-9][0-9]*) $

Verify positive real number with two decimal digits: ^[0-9]+ (. [ 0-9]{2})? $

Verify positive real number with 1-3 decimal digits: ^[0-9]+ (. [ 0-9]{1,3})? $

To validate a Non-zero positive integer: ^\+? [1-9] [0-9]*$

Validation of nonzero negative integers: ^\-[1-9][0-9]*$

Verify nonnegative integers (positive integer + 0) ^\d+$

Validates a positive integer (negative integer + 0) ^ ((-\d+) | ( 0+)) $

Verify the character with a length of 3: ^. {3}$

Verify a 26-letter string: ^[a-za-z]+$

Verify a string of 26 uppercase English letters: ^[a-z]+$

Verify a string consisting of 26 lowercase English letters: ^[a-z]+$

Verify a string consisting of numbers and 26 English letters: ^[a-za-z0-9]+$

Verify a string of numbers, 26 English letters, or underscores: ^\w+$

Verify user name or nickname often used: ^[\u4e00-\u9fa5a-za-z0-9-_]*$ only in English, numerals, underscores, minus

Verify user password: ^[a-za-z]\w{5,17}$ the correct format is: Start with a letter, length between 6-18, can only contain characters, numbers and underscores.

Verify that it contains ^%& ',; =?$\ ' and other characters:[^%& ', =?$\x22]+

Verify Chinese characters: ^[\u4e00-\u9fa5],{0,}$

Verify email Address: ^\w+[-+.] \w+) *@\w+ ([-.] \w+) *\.\w+ ([-.] \w+) *$

Verify interneturl:^http://([\w-]+\.) +[\w-]+ (/[\w-./?%&=]*) $ ^[a-za-z]+://(w+ (-w+) *) (. w+ (-w+) *) *) * (? s*)? $

Verify phone number: ^ (\ (\d{3,4}\) |\d{3,4}-)? \d{7,8}$:--the correct format is: xxxx-xxxxxxx,xxxx-xxxxxxxx,xxx-xxxxxxx,xxx-xxxxxxxx,xxxxxxx, XXXXXXXX.

Verify ID Number (15-bit or 18-digit number): ^\d{15}|\d{}18$

Verify 12 months of the year: ^ (0?[ 1-9]|1[0-2]) $ The correct format is: "01"-"09" and "1" "12"

Validation one months of 31 days: ^ (0?[ 1-9]) | ((1|2) [0-9]) $ |30|31) $ The correct format is: 01, 09, and 1, 31.

Integer: ^-?\d+$

Non-negative floating-point number (positive floating-point number + 0): ^\d+ (\.\d+)? $

Positive floating-point number ^ ([0-9]+\.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*)] $

Non-positive floating-point number (negative floating-point number + 0) ^ ((-\d+ (\.\d+)?) | (0+ (\.0+)) $

Negative floating-point number ^ (-([0-9]+\.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*))] $

Floating-point number ^ (-?\d+) (\.\d+)? $

Since the mobile phone number of the continuous update, the previous regular expression has been unable to meet the needs. Rewrite this expression,

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

Analysis of Expressions:

"/" represents a regular expression.

"^" represents the starting position of the string, and "$" represents the end position of the string.

“?” Represents a match to the previous character one or 0, so here's 0? The cell phone number can start with 0 or not 0.

The next part of the verification of the 11-bit mobile phone number, starting from 13, since 130-139 have so can be the selection between the [0-9],15 number is not 154 so [] There is no 4 this number, of course, can also be written [0-35-9], the following 18 and 14 open the number ibid.

The parentheses enclose a subexpression that contains 4 optional branches, respectively, with a "|" To distinguish between the "|" in the regular. The priority is the lowest, where each branch matches 3 characters (one [] can only match one character, inside is optional meaning), that is, mobile phone number of the first 3 digits, then there are 8 digits to match, can be 0-9 of any character, so is "[0-9]{8}", {} The number in represents the number of characters that match the preceding character.

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