Practical summary of JS regular expression verification numbers

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>

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!

Recommended reading:

How to use {n,m} quantifiers in regular expressions

Detailed explanation on the use of case-insensitive i modifier

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