JavaScript regular expression video tutorial

Many people have the impression that regular expressions are very powerful, difficult to learn, and difficult to remember. The credible goal of this course is to help everyone not remember regular expressions, but to understand regular expressions. With the help of graphical tools, everyone can intuitively experience regular expressions and use them with ease and ease. You understand that regular expressions are really simple!

Video playback address: http://www.php.cn/course/328.html

Difficulties of the video course There are too many things to remember at all, and they look very complicated:

Integers or decimals: ^[0-9]+\.{0,1}[0-9]{0,2} $
Only numbers can be entered: "^[0-9]*$".
Only n-digit numbers can be entered: "^\d{n}$".
You can only enter numbers with at least n digits: "^\d{n,}$".
Only m~n digits can be entered:. "^\d{m,n}$"
Only numbers starting with zero and non-zero can be entered: "^(0|[1-9][0-9]*)$".
Only positive real numbers with two decimal places can be entered: "^[0-9]+(.[0-9]{2})?$".
Only positive real numbers with 1 to 3 decimal places can be entered: "^[0-9]+(.[0-9]{1,3})?$".
Only non-zero positive integers can be entered: "^\+?[1-9][0-9]*$".
Only non-zero negative integers can be entered: "^\-[1-9][]0-9"*$.
Only characters with a length of 3 can be entered: "^.{3}$".
Only a string consisting of 26 English letters can be entered: "^[A-Za-z]+$".
Only a string consisting of 26 uppercase English letters can be entered: "^[A-Z]+$".
Only a string consisting of 26 lowercase English letters can be entered: "^[a-z]+$".
Only a string consisting of numbers and 26 English letters can be entered: "^[A-Za-z0-9]+$".
You can only enter 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 and 18, and can only contain characters, numbers and underscores.
Verify whether it contains characters such as ^%&',;=?$\": "[^%&',;=?$\x22]+".
Only Chinese characters can be entered: "^[\u4e00 -\u9fa5]{0,}$"
Verify email address:"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([- .]\w+)*$".
Verify InternetURL: "^http://([\w-]+\.)+[\w-]+(/[\w-./?%&= ]*)?$".
Verification phone number: "^(\(\d{3,4}-)|\d{3.4}-)?\d{7,8}$"The correct format is: "XXX-XXXXXXX", "XXXX-XXXXXXXX", "XXX-XXXXXXX", "XXX-XXXXXXXX", "XXXXXXX" and "XXXXXXXX" #Verification ID number (15 or 18 digits): "^ \d{15}|\d{18}$".
Verify the 12 months of a year: "^(0?[1-9]|1[0-2])$"The correct format is: " 01"～"09" and "1"～"12".
Verify the 31 days of a month: "^((0?[1-9])|((1|2)[0-9]) |30|31)$"The correct format is;"01"～"09" and "1"～"31". Regular expression to match Chinese characters: [\u4e00-\u9fa5]

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