Collect and share common regular expressions in php

Get all image URLs preg_match_all ("/src = (" | ') {0,} (http: // (. + ?)) ("| '| S |>)/is", $ text, $ img );

Regular Expression Matching Chinese characters: [u4e00-u9fa5]
Match double byte characters (including Chinese characters): [^ x00-xff]
Regular expression for matching empty rows: n [s |] * r
Regular expressions matching HTML tags:/<(. *)>. * </1> | <(. *)/>/
Regular expression matching the first and last Spaces: (^ s *) | (s * $)
Regular Expression Matching the Email address: w + ([-+.] w +) * @ w + ([-.] w + )*. w + ([-.] w + )*
Regular Expression Matching URL: ^ [a-zA-z] +: // (\ w + (-\ w + )*)(\. (\ w + (-\ w + )*))*(\? \ S *)? $
Match account validity (starting with a letter, may be 5-16 bytes, may be an alphanumeric underline): ^ [a-zA-Z] [a-zA-Z0-9 _] {} $
Match Chinese phone number: (d {3}-| d {4 }-)? (D {8} | d {7 })?
Match Tencent QQ number: ^ [1-9] * [1-9] [0-9] * $ <span id = "more-58"> </span>
"^ D + $" // non-negative integer (positive integer + 0)
"^ [0-9] * [1-9] [0-9] * $" // positive integer
"^ (-D +) | (0 +) $" // non-positive integer (negative integer + 0)
"^-[0-9] * [1-9] [0-9] * $" // negative integer
"^ -? D + $ "// integer
"^ D + (. d + )? $ "// Non-negative floating point number (positive floating point number + 0)
"^ ([0-9] +. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] *. [0-9] +) | ([0-9] * [1-9] [0-9] *) $ "// positive floating point number
"^ (-D + (. d + )?) | (0 + (. 0 + )?)) $ "// Non-positive floating point number (negative floating point number + 0)
"^ (-([0-9] +. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] *. [0-9] +) | ([0-9] * [1-9] [0-9] *) $ "// negative floating point number
"^ (-? D +) (. d + )? $ "// Floating point number
"^ [A-Za-z] + $" // A string consisting of 26 English letters
"^ [A-Z] + $" // a string consisting of 26 uppercase letters
"^ [A-z] + $" // a string consisting of 26 lowercase letters
"^ [A-Za-z0-9] + $" // string consisting of digits and 26 letters
"^ W + $" // a string consisting of digits, 26 letters, or underscores
"^ [W-] + (. [w-] +) * @ [w-] + (. [w-] +) + $" // email address
"^ [A-zA-z] +: // (w + (-w +) *) (. (w + (-w + )*))*(? S *)? $ "// Url
/^ (D {2} | d {4})-(0 ([1-9] {1}) | (1 [1 | 2]) -([0-2] ([1-9] {1}) | (3 [0 | 1]) $ // year-month-day
/^ (0 ([1-9] {1}) | (1 [1 | 2]) /([0-2] ([1-9] {1}) | (3 [0 | 1]) /(d {2} | d {4}) $ // month/day/year
"^ ([W-.] +) @ ([0-9] {1, 3 }. [0-9] {1, 3 }. [0-9] {1, 3 }.) | ([w-] + .) +) ([a-zA-Z] {2, 4} | [0-9] {1, 3}) (]?) $ "// Emil
/^ (+? [0-9] {2, 4}-[0-9] {3, 4}-) | ([0-9] {3, 4 }-))? ([0-9] {7,8}) (-[0-9] + )? $ // Phone number
"^ (D {1, 2} | 1dd | 2 [0-4] d | 25 [0-5]). (d {1, 2} | 1dd | 2 [0-4] d | 25 [0-5]). (d {1, 2} | 1dd | 2 [0-4] d | 25 [0-5]). (d {1, 2} | 1dd | 2 [0-4] d | 25 [0-5]) $ "// IP address

Metacharacters and their behavior in the context of regular expressions:

Mark the next character as a special character, a literal character, a back reference, or an octal escape character.

^ Matches the start position of the input string. If the Multiline attribute of the RegExp object is set, ^ matches the position after 'N' or 'R.

$ Matches the end position of the input string. If the Multiline attribute of the RegExp object is set, $ also matches the location before 'n' or 'R.

* Matches the previous subexpression zero or multiple times.

+ Match the previous subexpression once or multiple times. + Is equivalent to {1 ,}.

? Match the previous subexpression zero or one time .? It is equivalent to {0, 1 }.

{N} n is a non-negative integer that matches the specified n times.

{N ,}n is a non-negative integer and matches at least n times.

Both {n, m} m and n are non-negative integers, where n <= m. Match at least n times and at most m times. There must be no space between a comma and two numbers.

? When this character is followed by any other delimiter (*, + ,?, The matching mode after {n}, {n ,}, {n, m}) is not greedy. The non-greedy mode matches as few searched strings as possible, while the default greedy mode matches as many searched strings as possible.

. Match any single character except "n. To match any character including 'n', use a pattern like '[. n.
(Pattern) matches pattern and obtains this match.

(? : Pattern) matches pattern but does not get the matching result. That is to say, this is a non-get match and is not stored for future use.

(? = Pattern) forward pre-query: matches the search string at the beginning of any string that matches pattern. This is a non-get match, that is, the match does not need to be obtained for future use.

(?! Pattern) negative pre-query, and (? = Pattern).

X | y matches x or y.

[Xyz] character set combination.

[^ Xyz] combination of negative character sets.

[A-z] character range, matching any character in the specified range.

[^ A-z] the negative character range matches any character that is not within the specified range.

B matches a word boundary, that is, the position between a word and a space.

B matches non-word boundaries.

Cx matches the control characters specified by x.

D matches a numeric character. It is equivalent to [0-9].

D. Match a non-numeric character. It is equivalent to [^ 0-9].

F matches a form feed. It is equivalent to x0c and cL.

N matches a linefeed. It is equivalent to x0a and cJ.

R matches a carriage return. It is equivalent to x0d and cM.

S matches any blank characters, including spaces, tabs, and page breaks. It is equivalent to [fnrtv].

S matches any non-blank characters. It is equivalent to [^ fnrtv].

T matches a tab. It is equivalent to x09 and cI.

V matches a vertical tab. It is equivalent to x0b and cK.

W matches any word characters that contain underscores. It is equivalent to '[A-Za-z0-9 _]'.

W matches any non-word characters. It is equivalent to '[^ A-Za-z0-9 _]'.

Xn matches n, where n is the hexadecimal escape value. The hexadecimal escape value must be determined by the length of two numbers.

Num matches num, where num is a positive integer. References to the obtained matching.

N identifies an octal escape value or a backward reference. If n contains at least n obtained subexpressions, n is a back reference. Otherwise, if n is an octal digit (0-7), n is an octal escape value.

Nm identifies an octal escape value or a backward reference. If there are at least is preceded by at least nm obtained subexpressions before nm, then nm is backward reference. If at least n records are obtained before nm, n is a backward reference followed by m. If none of the preceding conditions are met, if n and m are octal numbers (0-7), nm matches the octal escape value nm.

If n is an octal digit (0-3) and m and l are octal numerals (0-7), nml matches the octal escape value nml.

Un matches n, where n is a Unicode character represented by four hexadecimal numbers.

Regular Expression Matching Chinese characters: [u4e00-u9fa5]

Match double byte characters (including Chinese characters): [^ x00-xff]

Regular expression for matching empty rows: n [s |] * r

Regular expressions matching HTML tags:/<(. *)>. * </1> | <(. *)/>/

Regular expression matching the first and last Spaces: (^ s *) | (s * $)

Regular Expression Matching the Email address: w + ([-+.] w +) * @ w + ([-.] w + )*. w + ([-.] w + )*

The regular expression matching the URL: http: // ([w-] +.) + [w-] + (/[w -./? % & =] *)?

Use regular expressions to restrict text box input in a webpage form:

You can only enter Chinese characters using regular expressions: onkeyup = "value = value. replace (/[^ u4E00-u9FA5]/g, '')" onbeforepaste = "clipboardData. setData ('text', clipboardData. getData ('text '). replace (/[^ u4E00-u9FA5]/g ,''))"

You can only enter the full-width characters: onkeyup = "value = value. replace (/[^ uFF00-uFFFF]/g, '')" onbeforepaste = "clipboardData. setData ('text', clipboardData. getData ('text '). replace (/[^ uFF00-uFFFF]/g ,''))"

Use a regular expression to limit that only numbers can be entered: onkeyup = "value = value. replace (/[^ d]/g, '')" onbeforepaste = "clipboardData. setData ('text', clipboardData. getData ('text '). replace (/[^ d]/g ,''))"

You can only enter numbers and English letters using regular expressions: onkeyup = "value = value. replace (/[W]/g, '')" onbeforepaste = "clipboardData. setData ('text', clipboardData. getData ('text '). replace (/[^ d]/g ,''))"

========= Regular expressions

Regular Expression Matching Chinese characters: [u4e00-u9fa5]

Match double byte characters (including Chinese characters): [^ x00-xff]

Regular expression for matching empty rows: n [s |] * r

Regular expressions matching HTML tags:/<(. *)>. * </1> | <(. *)/>/

Regular expression matching the first and last Spaces: (^ s *) | (s * $)

Regular Expression Matching IP address:/(d +). (d +)/g //

Regular Expression Matching the Email address: w + ([-+.] w +) * @ w + ([-.] w + )*. w + ([-.] w + )*

The regular expression matching the URL: http: // (/[w-] +.) + [w-] + (/[w -./? % & =] *)?

SQL statement: ^ (select | drop | delete | create | update | insert). * $

1. Non-negative integer: ^ d + $

2. Positive integer: ^ [0-9] * [1-9] [0-9] * $

3. Non-positive integer: ^ (-d +) | (0 +) $

4. Negative integer: ^-[0-9] * [1-9] [0-9] * $

5. Integer: ^ -? D + $

6. Non-negative floating point number: ^ d + (. d + )? $

7. Positive floating point: ^ (0-9) +. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] *. [0-9] +) | ([0-9] * [1-9] [0-9] *) $

8. Non-positive floating point number: ^ (-d +. d + )?) | (0 + (. 0 + )?)) $

9. Negative floating point number: ^ (-(regular expression of positive floating point number) $

10. English string: ^ [A-Za-z] + $

11. English capital string: ^ [A-Z] + $

12. Lowercase English string: ^ [a-z] + $

13. English character numeric string: ^ [A-Za-z0-9] + $

14. English digit and underline string: ^ w + $

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

16. URL: ^ [a-zA-Z] +: // (w + (-w + )*)(. (w + (-w + )*))*(? S *)? $
Or: ^ http: // [A-Za-z0-9] +. [A-Za-z0-9] + [/=? % -&_~ '@ []': +!] * ([^ <> ""]) * $

17. Zip code: ^ [1-9] d {5} $

18, Chinese: ^ [u0391-uFFE5] + $

19. Phone number: ^ (d {2, 3}) | (d {3 }-))? (0d {2, 3}) | 0d {2, 3 }-)? [1-9] d {6, 7} (-d {1, 4 })? $

20. Mobile phone number: ^ (d {2, 3}) | (d {3 }-))? 13d {9} $

21. Double byte characters (including Chinese characters): ^ x00-xff

22. Match the first and last Spaces: (^ s *) | (s * $) (trim functions like vbscript)

23. Matching HTML tags: <(. *)>. * </1> | <(. *)/>

24. Match null rows: n [s |] * r

25. Extract the network link in the Information: (h | H) (r | R) (e | E) (f | F) * = * ('| ")? (W | \ |/|.) + ('| "| * |> )?

26. Email address extracted from the information: w + ([-+.] w +) * @ w + ([-.] w + )*. w + ([-.] w + )*

27. Extract the image link from the Information: (s | S) (r | R) (c | C) * = * ('| ")? (W | \ |/|.) + ('| "| * |> )?

28. Extract the IP address in The Information: (d +). (d +)

29. Extract the Chinese mobile phone number from The Information: (86) * 0 * 13d {9}

30. Extract the Chinese landline number from The Information: (d {3, 4}) | d {3, 4}-| s )? D {8}

31. Extract Chinese phone numbers (including mobile and landline phone numbers) from the Information: (d {3, 4}) | d {3, 4}-| s )? D {7, 14}

32. Chinese ZIP code extracted from the information: [1-9] {1} (d +) {5}

33. Extract floating point numbers (decimal places) in The Information ):(-? D *).? D +

34. Extract any number from The Information :(-? D *) (. d + )?

35. IP address: (d +). (d +)

36. Phone no.:/^ 0d {2, 3} $/

37. Tencent QQ No.: ^ [1-9] * [1-9] [0-9] * $

38. Account (starting with a letter, may be 5-16 bytes, can contain letters and numbers underline): ^ [a-zA-Z] [a-zA-Z0-9 _] {} $

39. Chinese, English, numbers, and underscores: ^ [u4e00-u9fa5_a-zA-Z0-9] + $