Regular symbol description

1 Numbers ：^[0-9]*$ 

2 n Digit number ：^\d{n}$

3 At least n Digit number ：^\d{n,}$ 

4 m-n Digit number ：^\d{m,n}$ 

5 Zero and non-zero digits ：^(0|[1-9][0-9]*)$ 

6 A number with a maximum of two decimal places beginning with a nonzero ：^([1-9][0-9]*)+(.[0-9]{1,2})?$ 

7 belt 1-2 Positive or negative number of decimal places ：^(\-)?\d+(\.\d{1,2})?$ 

8 Positive numbers 、 negative 、 And decimal fraction ：^(\-|\+)?\d+(\.\d+)?$ 

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

10 Yes 1~3 Positive real number of decimal places ：^[0-9]+(.[0-9]{1,3})?$

11 Nonzero positive integer ：^[1-9]\d*$ or ^([1-9][0-9]*){1,3}$ or ^\+?[1-9][0-9]*$

12 Nonzero negative integer ：^\-[1-9][]0-9"*$ or ^-[1-9]\d*$

13 Non-negative integer ：^\d+$ or ^[1-9]\d*|0$

14 Non positive integer ：^-[1-9]\d*|0$ or ^((-\d+)|(0+))$

15 Nonnegative floating point number ：^\d+(\.\d+)?$ or ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$

16 Non positive floating point number ：^((-\d+(\.\d+)?)|(0+(\.0+)?))$ or ^(-([1-9]\d*\.\d*|0\.\d*[1-9]\d*))|0?\.0+|0$

17 Positive floating point ：^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$ or ^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$

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

19 Floating point numbers ：^(-?\d+)(\.\d+)?$ or ^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$

Two 、 Expression for check character

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

2 English and numbers ：^[A-Za-z0-9]+$ or ^[A-Za-z0-9]{4,40}$ 

3 The length is 3-20 All characters of ：^.{3,20}$ 

4 from 26 A string of English letters ：^[A-Za-z]+$ 

5 from 26 A string of uppercase letters ：^[A-Z]+$ 

6 from 26 A string of lowercase letters ：^[a-z]+$ 

7 By numbers and 26 A string of English letters ：^[A-Za-z0-9]+$ 

8 By digital 、26 A string of English letters or underscores ：^\w+$ or ^\w{3,20}$ 

9 chinese 、 english 、 Numbers include underscores ：^[\u4E00-\u9FA5A-Za-z0-9_]+$

10 chinese 、 english 、 Number but excluding symbols such as underscores ：^[\u4E00-\u9FA5A-Za-z0-9]+$ or ^[\u4E00-\u9FA5A-Za-z0-9]{2,20}$

11 Can be entered with ^%&',;=?$\" Equal character ：[^%&',;=?$\x22]+

12 Disable input containing ~ The characters of ：[^~\x22]+

3、 ... and 、 Expression of special requirements

1 Email Address ：^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$ 

2 domain name ：[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(/.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+/.? 

3 InternetURL：[a-zA-z]+://[^\s]* or ^http://([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?$ 

4 Phone number ：^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])\d{8}$ 

5 Phone number ("XXX-XXXXXXX"、"XXXX-XXXXXXXX"、"XXX-XXXXXXX"、"XXX-XXXXXXXX"、"XXXXXXX" and "XXXXXXXX)：^(\(\d{3,4}-)|\d{3.4}-)?\d{7,8}$  

6 Domestic phone number (0511-4405222、021-87888822)：\d{3}-\d{8}|\d{4}-\d{7} 

7 ID number (15 position 、18 Digit number )：^\d{15}|\d{18}$ 

8 Short ID number ( Numbers 、 Letter x ending )：^([0-9]){7,18}(x|X)?$ or ^\d{8,18}|[0-9x]{8,18}|[0-9X]{8,18}?$ 

9 Is the account number legal ( Beginning of letter , allow 5-16 byte , Allow alphanumeric underscores )：^[a-zA-Z][a-zA-Z0-9_]{4,15}$

10 password ( Start with a letter , The length is in 6~18 Between , Can only contain letters 、 Numbers and underscores )：^[a-zA-Z]\w{5,17}$

11 Strong password ( Must contain a combination of upper and lower case letters and numbers , Special characters cannot be used , The length is in 8-10 Between )：^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$

12 Date format ：^\d{4}-\d{1,2}-\d{1,2}

13 One year 12 Months (01～09 and 1～12)：^(0?[1-9]|1[0-2])$

14 A month 31 God (01～09 and 1～31)：^((0?[1-9])|((1|2)[0-9])|30|31)$

15 Input format of money ：

16 1. There are four forms of money we can accept :"10000.00" and "10,000.00", And no " branch " Of "10000" and "10,000"：^[1-9][0-9]*$

17 2. This means that either of them can't 0 Number at the beginning , however , It also means a character "0" Not through , So we take the following form ：^(0|[1-9][0-9]*)$

18 3. One 0 Or one doesn't 0 Number at the beginning . We can also allow a minus sign at the beginning ：^(0|-?[1-9][0-9]*)$

19 4. This means a 0 Or a start that may be negative is not 0 The number of . Let users 0 The beginning is good. . Remove the minus sign as well , Because money can't be negative . What we're going to add here is the possible decimal part ：^[0-9]+(.[0-9]+)?$

20 5. It must be noted that , There should be at least one after the decimal point 1 digit , therefore "10." No way , however "10" and "10.2" Yes. ：^[0-9]+(.[0-9]{2})?$

21 6. In this way, we stipulate that there must be two decimal places after the decimal point , If you think it's too harsh , It can be like this ：^[0-9]+(.[0-9]{1,2})?$

22 7. This allows the user to write only one decimal place . Now it's time to think about commas in numbers , We can do this ：^[0-9]{1,3}(,[0-9]{3})*(.[0-9]{1,2})?$

23 8.1 To 3 A digital , Follow any one comma +3 A digital , Comma as optional , Not necessarily ：^([0-9]+|[0-9]{1,3}(,[0-9]{3})*)(.[0-9]{1,2})?$

24 remarks ： This is the end result , Don't forget "+" It can be used "*" Instead, if you think empty strings are acceptable ( strange , Why? ?) Last , Don't forget to remove the backslash when using functions , Common mistakes are here

25 xml file ：^([a-zA-Z]+-?)+[a-zA-Z0-9]+\\.[x|X][m|M][l|L]$

26 Regular expression of Chinese characters ：[\u4e00-\u9fa5]

27 Double byte character ：[^\x00-\xff] ( Including Chinese characters , Can be used to calculate the length of a string ( A double byte character length meter 2,ASCII Character meter 1))

28 Regular expression for blank lines ：\n\s*\r ( Can be used to delete blank lines )

29 HTML Tagged regular expression ：<(\S*?)[^>]*>.*?</\1>|<.*? /> ( The version circulating on the Internet is too bad , This one is only part of it , There's nothing we can do about complex nested tags )

30 Regular expression of first and last whitespace characters ：^\s*|\s*$ or (^\s*)|(\s*$) ( Can be used to delete blank characters at the beginning and end of a line ( Including Spaces 、 tabs 、 Page breaks and so on ), Very useful expressions )

31 tencent QQ Number ：[1-9][0-9]{4,} ( tencent QQ Number from 10000 Start )

32 China Post Code ：[1-9]\d{5}(?!\d) ( China Post code is 6 Digit number ) 33 IP Address ：\d+\.\d+\.\d+\.\d+ ( extract IP Useful for addresses ) 34 IP Address ：((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))