Practical summary of JS regular expression verification numbers-JS Tutorial-php.cn

Practical summary of JS regular expression verification numbers

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Release： 2018-03-30 14:10:38

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This time I will bring you JSregular expressionA practical summary of verifying numbers, what are the notes of JS regular expression verification of numbers, the following is a practical case, let's come together take a look.

Regular expression (regular expression) describes a string matching pattern, which can be used to check whether a string contains a certain substring, replace the matching substring, or extract the matching substring from a certain string. A substring of a certain condition, etc.

Look at the js code first, as shown below:

<script type="text/javascript">
function SubmitCk() {
var reg = /^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;
if (!reg.test($("#txtEmail").val())) {
alert("请输入正确邮箱地址")
return false;
}
}
</script>

Copy after login

Regular expression set for verifying numbers

Verification numbers: ^[0-9 ]*$

Verify n-digit number: ^\d{n}$

Verify at least n-digit number: ^\d{n,}$

Verify m-n Number of digits: ^\d{m,n}$

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

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

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

Verify non-zero positive integers: ^\+?[1-9][0-9]*$

Verify non-zero negative integers: ^\-[1-9][0-9]*$

Verify non-negative integers (positive integers + 0) ^\d+$

Verify non-positive integers (negative integers + 0) ^((-\d+)|(0+))$

Verify characters of length 3: ^.{3}$

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

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

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

Verify whether it contains characters such as ^%&',;=?$\": [^%&',;=?$\x22]+

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

Verify email address:/^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA- Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2 ,3}$/

Verify InternetURL: ^http://([\w-]+\.)+[\w-]+(/[\w-./?%&=]* )?$ ;^[a-zA-z]+://(w+(-w+)*)(.(w+(-w+)*))*(?S*)?$

Verify Phone number: ^(\d3,4|\d{3,4}-)?\d{7,8}$:--The correct format is: XXXX-XXXXXXX, XXXX-XXXXXXXX, XXX-XXXXXXX, XXX-

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

Verify 31 days in a month: ^((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+)?$

I believe you will read the case in this article You have mastered the method. For more exciting information, please pay attention to other related articles on the PHP Chinese website!