List of common regular expressions

1. Validation numbers: ^[0-9]*$
2. Verify n digits: ^\d{n}$
3. Verify at least n digits: ^\d{n,}$
4. Verify mn digits: ^\d{m,n}$
5. Validate zero and non-zero leading numbers: ^(0|[1-9][0-9]*)$
6. Validate positive real numbers with two decimal places: ^[0-9]+(.[0-9]{2})?$
7. Verify positive real numbers with 1-3 decimal places: ^[0-9]+(.[0-9]{1,3})?$
8. Validate non-zero positive integers: ^\+?[1-9][0-9]*$
9. Validate non-zero negative integers: ^\-[1-9][0-9]*$
10. Validate non-negative integers (positive integer + 0 ): ^\d+$
11. Validate non-positive integers (negative integers + 0 ): ^((-\d+)|(0+))$
12. Validate characters of length 3 : ^.{3}$
13. Validate a string of 26 English letters: ^[A-Za-z]+$
14. Validate a string of 26 uppercase English letters: ^[AZ]+$
15. Validate a string consisting of 26 lowercase English letters: ^[az]+$
16. Validate a string consisting of numbers and 26 English letters: ^[A-Za-z0-9]+$
17. Validate a string consisting of numbers, 26 English letters or underscores: ^\w+$
18. Start with a letter, length between 6-18 , can only contain characters, numbers and underscores : ^[a-zA-Z]\w{5,17}$
19. Verify that it contains characters such as ^%&',;=?$\": [^%&',;=?$\x22]+
20. Verify Chinese characters: ^[\u4e00-\u9fa5],{0,}$
21. Verify Email Address: ^\w+[-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$
22. 验证InternetURL：^http://([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?$
23. Verify phone number: ^(((13[0-9])|(15([0-3]|[5-9]))|(18[0,5-9]))\d{8}) |(0\d{2}-\d{7,8})|(0\d{3}-\d{7,8})$
24. Verify ID number (15 or 18 digits): ^\d{15}|\d{18}|\d{17}X$
25. Verify the 12 months of a year: ^(0?[1-9]|1[0-2])$ The correct format is: "01"-"09" and "1" "12"
26. 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.
27. Integer: ^-?\d+$
28. Non-negative float (positive float + 0 ): ^\d+(\.\d+)?$
29. Non-positive float (negative float + 0 ): ^((-\d+(\.\d+)?)|(0+(\.0+)?))$
30. Number of floating points ^ (-(([0-9] + \. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0- 9] * \. [0-9] +) | ([0-9] * [1-9] [0-9] *))) $
31. float ^(-?\d+)(\.\d+)?$