Shulou(Shulou.com)06/02 Report--

This article introduces the relevant knowledge of "PHP regular expression Collection". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

First, take a look at the regular expression mind map:

I. the expression of the check number

1 number:

^ [0-9] * $

2 n-digit numbers:

^\ d {n} $

3 at least n-digit numbers:

^\ d {n,} $

4mmurn digits:

^\ d {mdirection n} $

5 numbers starting with zero and non-zero:

^ (0 | [1-9] [0-9] *) $

A non-zero number with up to two decimal places:

^ ([1-9] [0-9] *) + (. [0-9] {1pm 2})? $

7 positive or negative numbers with 1-2 decimal places:

^ (\ -)?\ d + (\.\ d {1pr 2})? $

8 positive, negative, and decimal numbers:

^ (\-|\ +)?\ d + (\.\ d +)? $

9 positive real numbers with two decimal places:

^ [0-9] + (. [0-9] {2})? $

10 positive real numbers with 1 to 3 decimal places:

^ [0-9] + (. [0-9] {1pr 3})? $

11 non-zero positive integers:

^ [1-9]\ Dao $or ^ ([1-9] [0-9] *) {1 # 3} $or ^\ +? [1-9] [0-9] * $

12 non-zero negative integers:

^\-[1-9] [] 0-9 "* $or ^-[1-9]\ dbath $

13 non-negative integers:

^\ d $or ^ [1-9]\ d* | 0 $

14 non-positive integer:

^-[1-9]\ d* | 0$ or ^ ((-\ d+) | (0 +)) $

15 non-negative floating point numbers:

^\ d + (\.\ d +)? $or ^ [1-9]\ d *\.\ d * | 0\.\ d * [1-9]\ d * | 0?\ .0 + | 0 $

16 non-positive floating point numbers:

^ ((-\ d+ (\.\ d+)?) | (0 + (\ .0 +)) $or ^ (- ([1-9]\ d*\.\ d* | 0.\ d* [1-9]\ d*)) | 0?\ .0 + | 0 $

17 positive 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] *) $)

18 negative floating point numbers:

^-([1-9]\ d *.\ d * | 0\.\ d * [1-9]\ d *) $or ^ (0-9) +. [0-9] *. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] *)) $)

19 floating point number:

^ (-?\ d +) (\.\ d +)? $or ^ -? ([1-9]\ d *.\ d * | 0.\ d * [1-9]\ d * | 0?\ .0 + | 0) $

Second, the expression of check characters

1 Chinese characters:

^ [\ u4e00 -\ u9fa5] {0,} $

2 English and figures:

^ [A-Za-z0-9] + $or ^ [A-Za-z0-9] {4jue 40} $

3 all characters with a length of 3-20:

^. {3pm 20} $

4 A string consisting of 26 English letters:

^ [A-Za-z] + $

5 A string of 26 uppercase letters:

^ [Amurz] + $

6 A string of 26 lowercase letters:

^ [aMuz] + $

7 A string consisting of numbers and 26 letters:

^ [A-Za-z0-9] + $

8 A string consisting of numbers, 26 letters, or underscores:

^\ w $or ^\ w {3jin20} $

9 Chinese, English, numbers including underscores:

^ [\ u4E00 -\ u9FA5A-Za-z0-9 _] + $

10 Chinese, English, numbers but excluding underscores and other symbols:

^ [\ u4E00 -\ u9FA5A-Za-z0-9] + $or ^ [\ u4E00 -\ u9FA5A-Za-z0-9] {2jue 20} $

11 you can enter characters such as ^% &',; =? $\ ":

[^% &',; =? $\ x22] +

12 it is forbidden to enter characters containing ~:

[^ ~\ x22] +

III. Expression of special requirements

1. Email address:

^\ w+ ([- +.]\ w+) * @\ w+ ([-.]\ w+) *.\ w+ ([-.]\ w+) * $

2. Domain name:

[a-zA-Z0-9] [- a-zA-Z0-9] {0a-zA-Z0 62} (/. [a-zA-Z0-9] [- a-zA-Z0-9] {0girls 62}) + /.?

3 、 InternetURL:

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

4. Mobile phone number:

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

Telephone numbers ("XXX-XXXXXXX", "XXXX-XXXXXXXX", "XXX-XXXXXXX", "XXX-XXXXXXXX", "XXXXXXX" and "XXXXXXXX"):

^ (\ (\ d {3jue 4} -) |\ d {3.4} -)?\ d {7je 8} $

6 domestic telephone number (0511-4405222, 021-87888822):

\ d {3} -\ d {8} |\ d {4} -\ d {7}

7. ID number:

15-or 18-digit ID card:

^\ d {15} |\ d {18} $

15-digit ID card:

^ [1-9]\ d {7} ((0\ d) | (1 [0-2])) (([0 | 1 | 2]\ d) | 3 [0-1])\ d {3} $

18-digit ID card:

^ [1-9]\ d {5} [1-9]\ d {3} ((0\ d) | (1 [0-2])) (([0 | 1 | 2]\ d) | 3 [0-1])\ d {4} $

8. Short ID card number (number, ending with letter x):

^ ([0-9]) {7pm 18} (x | X)? $

Or

^\ d {8pr 18} | [0-9x] {8pr 18} | [0-9X] {8pr 18}? $

9. Whether the account is legal (5-16 bytes are allowed at the beginning of the letter, and alphanumeric underscores are allowed):

^ [a-zA-Z] [a-zA-Z0-9 _] {4pm 15} $

10. Password (begins with a letter, is between 6 and 18 in length, and can only contain letters, numbers and underscores):

^ [a-zA-Z]\ w {5pm 17} $

11. Strong password (must contain a combination of uppercase and lowercase letters and numbers, cannot use special characters, and the length is between 8 and 10):

^ (? = .*\ d) (? = .* [amurz]) (? = .* [Amurz]). {8jue 10} $

12. Date format:

^\ d {4} -\ d {1pm 2} -\ d {1pm 2}

13. 12 months of the year (01-09 and 1-12):

^ (0? [1-9] | 1 [0-2]) $

14. 31 days of the month (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 that we can accept: "10000.00" and "10000.00", and "10000" and "10000" without "points":

^ [1-9] [0-9] * $

17 、 2. This means any number that does not start with 0, but it also means that a character "0" does not pass, so we take the following form:

^ (0 | [1-9] [0-9] *) $

18 、 3. A 0 or a number that does not start with 0. We can also allow a minus sign at the beginning:

^ (0 | -? [1-9] [0-9] *) $

19 、 4. This represents a 0 or a number that may be negative and begins with a non-zero. Let the user start with 0. Get rid of the negative sign, too, because the money can't be negative. What we are going to add is the possible decimal part:

^ [0-9] + (. [0-9] +)? $

20 、 5. It must be noted that there should be at least 1 digit after the decimal point, so "10." It is not approved, but "10" and "10.2" are passed:

^ [0-9] + (. [0-9] {2})? $

21 、 6. In this way, we stipulate that there must be two places after the decimal point, and if you think it is too harsh, you can do this:

^ [0-9] + (. [0-9] {1pr 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] {1jue 3} (, [0-9] {3}) * (. [0-9] {1jue 2})? $

23, 8.1 to 3 digits, followed by any comma + 3 digits, comma becomes optional rather than necessary:

^ ([0-9] + | [0-9] {1jue 3} (, [0-9] {3}) *) (. [0-9] {1jue 2})? $

24. Note: this is the end result. Don't forget that "+" can be replaced with "*" if you think an empty string is acceptable (strange, why?) Finally, don't forget to remove the backslash when using the function. The usual mistakes are here.

25. Xml file:

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

26. Regular expressions of Chinese characters:

[\ u4e00 -\ u9fa5]

27. Double-byte characters:

[^\ X00 -\ xff]

(including Chinese characters, it can be used to calculate the length of a string (a double-byte character length meter, 2meme ASCII character counter 1))

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

29. Regular expression of the HTML tag:

] * >. *? | (the version circulated on the Internet is too bad, the above one is only partial, and there is still nothing I can do about complex nested tags)

30. Regular expression of white space characters: ^\ s* |\ sblank $or (^\ s*) | (\ sblank $) (can be used to delete white space characters at the beginning and end of a line (including spaces, tabs, page feeds, etc.), a very useful expression)

31. Tencent QQ number: [1-9] [0-9] {4,} (Tencent QQ number starts from 10000)

32. China Postal Code: [1-9]\ d {5} (?!\ d) (China Postal Code is 6 digits)

33. IP address:\ d +\.\ d + (useful when extracting IP address)

This is the end of the content of PHP regular expressions. Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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