20 Regular Expressions (JavaScript version) that will allow you to write less than 1000 lines of code

Regular expressions are often used for validation of fields or arbitrary strings, such as the following to verify the basic date format JavaScript code:

var reg =/^ (\\d{1,4}) (-|\\/) (\\d{1,2}) \\2 (\\d{1,2}) $/; var r = Fieldvalue.match (reg); if (r==null) alert (' Date format error! ');

1. Verify Password strength
the strength of the password must be a combination of uppercase and lowercase letters and numbers, no special characters, and a length of 8-10.

^ (? =.*\\d) (? =.*[a-z]) (? =.*[a-z]). {8,10}$

2. Verifying Chinese
The string can only be in Chinese.

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

3. A string of numbers, 26 English letters, or underscores

^\\w+$

4. Verify the e-mail address
As with the password, here are the Regular check statements for e-mail address compliance.

[\\w!#$%& ' *+/=?^_ ' {|} ~-]+(?:\ \. [\\w!#$%& ' *+/=?^_ ' {|} ~-]+) *@ (?: [\\w] (?: [\\w-]*[\\w])? \ \.) +[\\w] (?: [\\w-]*[\\w])?

5. Check the ID number
The following is a regular check of the ID number. 15 or 18 bits.
15-bit:

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

18-bit:

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

6. Check the date
Date checksum in "YYYY-MM-DD" format, which has been considered for a flat leap year.

^(?:(?! 0000) [0-9]{4}-(?:(?: 0 [1-9]|1[0-2])-(?: 0 [1-9]|1[0-9]|2[0-8]) | (?: 0 [13-9]|1[0-2])-(?: 29|30) | (?: 0 [13578]|1[02])-31) | (?: [0-9]{2} (?: 0 [48]| [2468] [048]| [13579] [26]) | (?: 0 [48]| [2468] [048]| [13579] [26]) 00)-02-29) $

7. Check the amount
The amount of the check, accurate to 2 decimal places.

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

8. Check the phone number
The following is the domestic mobile phone number 13, 15, 18, the regular expression. (Can be expanded according to the current domestic collection number of the first two-digit opening 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}$

9. Determine the version of IE
IE has not been completely replaced, many pages still need to do version compatibility, the following is the version of IE to check the expression.

^.*msie [5-8] (?: \ \. [0-9]+]? (?!. *trident\\/[5-9]\\.0). *$

10. Verifying the IP-V4 Address
IP4 the regular statement.

\\b (?:(? : 25[0-5]|2[0-4][0-9]| [01]? [0-9] [0-9]?) \\.) {3} (?: 25[0-5]|2[0-4][0-9]| [01]? [0-9] [0-9]?) \\b

11. Verifying the IP-V6 Address
IP6 the regular statement.

(([0-9a-fa-f]{1,4}:) {7,7}[0-9a-fa-f]{1,4}| ( [0-9a-fa-f] {1,4}:) {1,7}:| ([0-9a-fa-f]{1,4}:) {1,6}:[0-9a-fa-f]{1,4}| ( [0-9a-fa-f] {1,4}:) {1,5} (: [0-9a-fa-f]{1,4}) {1,2}| ([0-9a-fa-f]{1,4}:) {1,4} (: [0-9a-fa-f]{1,4}) {1,3}| ( [0-9a-fa-f] {1,4}:) {1,3} (: [0-9a-fa-f]{1,4}) {1,4}| ([0-9a-fa-f]{1,4}:) {] (: [0-9a-fa-f]{1,4}) {1,5}|[ 0-9a-fa-f]{1,4}:((: [0-9a-fa-f]{1,4}) {1,6}) |:( (: [0-9a-fa-f]{1,4}) {1,7}|:) | FE80: (: [0-9a-fa-f]{0,4}) {0,4}%[0-9a-za-z]{1,}|::(FFFF (: 0{1,4}) {0,1}:) {0,1} ((25[0-5]| ( 2[0-4]|1{0,1}[0-9]) {0,1}[0-9]) \ \.) {3,3} (25[0-5]| (2[0-4]|1{0,1}[0-9]) {0,1} [0-9]) | ([0-9a-fa-f]{1,4}:) {1,4}:((25[0-5]| ( 2[0-4]|1{0,1}[0-9]) {0,1}[0-9]) \ \.) {3,3} (25[0-5]| (2[0-4]|1{0,1}[0-9]) {0,1} [0-9]))

12. Check the prefix of the URL
many times in application development the need to differentiate between requests is HTTPS or HTTP, the following expression can be used to remove the prefix of a URL and then logically judge.

if (!s.match (/^[a-za-z]+:\\/\\//)) {

s = '/http ' + s;}

13. Extracting URL Links
The following expression can filter out the text in the Url.

^ (F|HT) {1} (TP|TPS): \\/\\/([\\w-]+\\.) +[\\w-]+ (\\/[\\w-./?%&=]*)?

14. File paths and extended schools
Verify The file path and extension under Windows (. txt file in the following example)

^ ([a-za-z]\\:|\\\\) \\\\ ([^\\\\]+\\\\) *[^\\/:*? " <>|] +\\.txt (l)? $

15. Extract the color Hex Codes
Sometimes you need to extract the color code from the Web page, and you can use the following expression.

^# ([a-fa-f0-9]{6}| [A-fa-f0-9] {3}) $

16. Extract Web Images
If you want to extract all the image information from a webpage, you can use the following expression.

\\< *[IMG][^\\\\>]*[SRC] *= *[\\ "\ \"]{0,1} ([^\\] \ \ \ >]*)

17. Extract Page Hyperlinks
extracts hyperlinks in HTML.

(<a\\s* (?!. *\\brel=) [^>]*] (href= "https?:\ \/\\/)((?! (?:(?: www\\.)? '. Implode (' | (?: www\\.)? ', $follow _list)) [^"]+)"((?!. *\\brel=) [^>]*] (?: [^>]*) >

18. Find CSS Properties
The following expression allows you to search for a matching CSS Properties.

^\\s*[a-za-z\\-]+\\s*[:]{1}\\s[a-za-z0-9\\s.#]+[;] {1}

19. Extracting annotations
If you need to remove Note In HMTL, you can use the following expression.

<!--(. *?) -

20. Matching HTML tags
The following expression can be used to match the The label attribute in HTML.

<\\/?\\w+ (\\s+\\w+ (\\s*=\\s* (?: ". *?" | ". *? ' | [\\^ ' ">\\s]+)") +\\s*|\\s*) \\/?>

20 Regular Expressions (JavaScript version) that will allow you to write less than 1000 lines of code