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This article introduces the knowledge of "what are the commonly used JS regular expressions". 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!

1. Numeric validation expression

Demand expression number ^ [0-9] * the number of $n bit ^\ d {n} $mmurn bit ^\ d {m N} $zero and non-zero beginning numbers ^ (^ ([1-9] [0-9] *) + (. [0-9] {1m 2})? $positive or negative numbers with 1-2 decimal places ^ (\ -)?\ d + (\.\ d {1pc2})? $positive, negative, And decimal ^ (\-|\ +)?\ d+ (\.\ d+)? $positive real number ^ [0-9] + (. [0-9] {2}) with two decimal places? $positive real number ^ [0-9] + (. [0-9] {1 ^ 3})? $non-zero positive integer ^ [1-9]\ dcounting $or ^ ([1-9] [0-9] *) {1pm 3} $or ^\ +? [1-9] [0-9] * $non-zero negative integer ^\-[1-9] [] 0-9 "* $or ^-[1-9]\ dcircle $non-negative integer ^\ DX $or ^ [1-9]\ d* | 0$ non-positive integer ^-[1-9]\ d* | 0$ or ^ (-\ d+) | (0 +) $non-negative floating point number ^\ d+ (\.\ d+)? $or ^ [1-9]\ d*\ .\ d* | 0\.\ d* [1-9]\ d* | 0?\ .0 + | 0$ non-positive floating point ^ ((-\ d+ (\.\ d+)?) | (0 + (\ .0 +)?)) $or ^ (([1-9]\ d*\.\ d* | 0.\ d* [1-9]\ d*)) | 0?\ .0 + | 0$ positive floating point ^ [1-9]\ d*.\ d* | 0.\ d* [1-9]. 9] [0-9] $or ^ (([0-9] +. [0-9] * [1-9] [0-9] *) | ([0-9] * [1-9] [0-9] +) | ([0-9] * [1-9] [0-9] *)) $negative 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] * [1-9] [0-9] *) $floating point number ^ (-?\ d +) (\.\ d +)? $or ^ -? ([1-9]\ d *\.\ d * | 0\.\ d * [1-9]\ d* | 0?\ .0 + | 0) at least n bits ^\ d {n } $

2. Character validation expression

Demand expression Chinese character ^ [\ u4e00 -\ u9fa5] {0 } $English and numbers ^ [A-Za-z0-9] + $or ^ [A-Za-z0-9] {4pm 40} $all characters 3-20 in length ^. {3pm 20} $string of 26 letters ^ [A-Za-z] + $string of 26 uppercase letters ^ [Amurz] + $string of 26 lowercase letters ^ [A-Za-z] + $consisting of numbers and The 26-letter string ^ [A-Za-z0-9] + $consists of numbers, A string consisting of 26 English letters or underscores ^\ w {3 u9FA5A-Za-z0 20} $Chinese, English, numbers including underscores ^ [\ u4E00 -\ u9FA5A-Za-z0-9] + $, English, numbers but excluding symbols such as underscores ^ [\ u4E00 -\ u9FA5A-Za-z0-9] + $or ^ [\ u4E00 -\ u9FA5A-Za-z0-9] {2} 20} $can be entered with ^% &' Characters such as =? $\ "[^% &',; =? $\ x22] + prohibit the input of characters containing ~ [^ ~\ x22] +. * match any Chinese characters except\ n / [\ u4E00 -\ u9FA5] /

3. Special requirements expression

Requirement expression Email address ^\ w+ ([- +.]\ w+) * @\ w+ ([-.]\ w+) *\.\ w+ ([-.]\ w+) * $domain name [a-zA-Z0-9] [- a-zA-Z0-9] {0a-zA-Z0 62} (/. [a-zA-Z0-9] [- a-zA-Z0-9] {0jue 62}) + /.? InternetURL [a-zA-z] +: / / [^\ s] * Or ^ http://([\w-]+\.)+[\w-]+(/[\w-./?%&=]*)?$ Mobile phone number ^ (13 [0-9] | 14 [5 | 7] | 15 [0 | 1 | 2 | 3 | 5 | 6 | 7 | 8 | 9] | 18 [0 | 1 | 2 | 5 | 6 | 7 | 8 | 9])\ d {8} $phone number ("XXX-XXXXXXX", "XXXX-XXXXXXXX", "XXX-XXXXXXX", "XXX-XXXXXXXX", "XXXXXXX" and "XXXXXXXX) ^ (\ (\ d {3, 4} -) |\ d {3. 4} -)?\ d {7} $domestic telephone number (0511-4405222, 021-87888822)\ d {3} -\ d {8} |\ d {4} -\ d {7} ID card number (15 digits, 18 digits) ^\ d {15} |\ d {18} $short ID card number (number, number, 18 digits) End of letter x) ^ ([0-9]) {7Magne18} (x | X)? $or ^\ d {8pr 18} | [0-9x] {8pr 18} | [0-9X] {8p 18}? is the account legal (beginning with the letter)? Allow 5-16 bytes, alphanumeric underscore) ^ [a-zA-Z] [a-zA-Z0-9 _] {4jue 15} $

Password (starts with a letter, is between 6 and 18 in length and can only contain letters, numbers and underscores) ^ [a-zA-Z]\ w {5pc17} $strong password (must contain a combination of uppercase and lowercase letters and numbers, no special characters can be used The length is between 8 and 10) ^ (? =. *\ d) (? =. * [Amurz]) (? =. * [Amurz]). {8pm 10} $date format ^\ d {4} -\ d {1J 2} -\ d {1J 2} 12 months of a year (01x 09 and 1x 12) ^ (0? [1-9] | 1 [0-2]) 31 days of a month (01pm 09 and 1x 31) ^ (0? [ 1-9]) | (1 | 2) [0-9]) | 30 | 31) expressions of $"10000.00" and "10000.00" And expressions of "10000" and "10000" ^ [1-9] [0-9] * $without "points" Any number that does not start with 0, however, this also means that a character "0" does not pass the expression of ^ (0 | [1-9] [0-9] *) $, a 0 or a number that does not start with 0. We can also allow a negative sign ^ (0 | -? [1-9] [0-9] *) $0 or a number that may be negative and begins with a non-zero. Let the user start with 0. Remove the minus sign, too. What we want to add next is the possible decimal part ^ [0-9] + (. [0-9] +)? $it must be stated that there should be at least 1 digit after the decimal point, so "10." No, but "10" and "10.2" are passed by ^ [0-9] + (. [0-9] {2})? there must be two places ^ [0-9] + (. [0-9] {1)) after the $decimal point? $allows the user to write only one decimal place. Comma ^ [0-9] {1pc3} (, [0-9] {3}) * (. [0-9] {1pc2})? $1 to 3 digits, followed by any comma + 3 digits, comma becomes optional rather than necessary ^ ([0-9] + | [0-9] {1 + 3}) [0-9] {3}) *) (. [0-9] {1 u9fa5 2})? $xml file ^ ([a-zA-Z] + -?) + [a-zA-Z0-9] +\. [X | X] [m | M] [l | L] $Chinese characters [\ u4e00 -\ u9fa5] double-byte characters [^\ x00 -\ xff] (including Chinese characters) Can be used to calculate the length of a string (a double-byte character length meter)) blank lines\ n\ s *\ r (can be used to delete blank lines) HTML tag] * >. *? | (incomplete Need to find separately) the leading and trailing blank 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.) Very useful expression) Tencent QQ number [1-9] [0-9] {4 } (Tencent QQ number starts from 10000) China Postal Code [1-9]\ d {5} (?!\ d) (China Postal Code is 6 digits) IP address\ d +\.\ d + (useful when extracting IP address) IP address ((?): (?) 25 [0-5] | 2 [0-4]\ d | [01]?\ d?\ d)\\.) {3} ( ?: 25 [0-5] | 2 [0-4]\ d | [01]?\\ d?\\ d) IP-v4 address\\ 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 (useful when extracting IP addresses) verify IP-v6 addresses

(([0-9a-fA-F] {1rect 4}:) {79a-fA-F 7} [0-9a-fA-F] {1pr 4} | ([0-9a-fA-F] {1pr 4}:) {1Mague 7}: | ([0-9a-fA-F] {1pr 4}:) {1pr 6}: [0-9a-fA-F] {1pr 4} | ([0-9a-fA-F] {1pm 4}:) {1pm 5} (: [0-9a-fA-F] {1pm 4}) {1pm 2}) | | ([0-9a-fA-F] {1score4}:) {19a-fA-F 4} (: [0-9a-fA-F] {1score4}) {19a-fA-F 3} | ([0-9a-fA-F] {1Power4}:) {19a-fA-F 3} (: [0-9a-fA-F] {1pr 4}) {1c4} | ([0-9a-fA-F] {1pr 4}:) {1pr 2} (: [0-9a-fA-F] {1pm 4}) {1pm 5} | ] {19a-fA-F 4}: (: [0-9a-fA-F] {1 9a-fA-F 4}) {1 9a-zA-Z 6}) | (: (: [0-9a-fA-F] {1 9a-zA-Z 4}) {1 9a-fA-F 7} |:) | (: [0-9a-fA-F] {0pr 4}) {0pr 4}% [0 -] {1 | |:: (ffff (: 0 {0 9a-fA-F 4}) {0Power1}:) {0ffff 1} ((25 [0-5]) | (2 [0-4] | 1 {0Power1} [0-9]) {0Magne1} [0-9]) {0Magne1} (25 [0-5] | (2 [0-4] | 1 {0quotient 1} [0-9]) {0jin1} [0-9]) | ([0-0] 1}:) {1pm 4}: (25) [0-5] | (2 [0-4] | 1 {0rect 1} [0-9]) {0rect 1} [0-9])\\.) {3jue 3} (25 [0-5] | (2 [0-4] | 1 {0jue 1} [0-9]))

Subnet mask ((?: 25 [0-5] | 2 [0-4]\ d | [01]?\\ d?\\ d)\\.) {3} (?: 25 [0-5] | 2 [0-4]\ d | [01]?\ d?\\ d)) check date

^ (?: (! 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-

Format date check, has considered flat leap year $(date check in "yyyy-mm-dd" format, has considered flat leap year.) Extract comments to find CSS attributes ^\\ s * [a-zA-Z\\ -] +\\ s * [:] {1}\\ s [a-zA-Z0-9\\ s.#] + [;] {1} extract page hyperlinks

(] *) (href= "https?:\ /\ /) ((?! (: (?: (?: www\\.)?'. Implode ('| (?: www\\.), $follow_list).)) [^" rel= "external nofollow"] +) "((?. *\\ brel=) [^ >] *) (?: [^ >] *) >

Extract web page images\\

] * [src] * = * [\ "\] {0Magne1} ([^\"\] *) extract the web page color code ^ # ([A-Fa-f0-9] {6} | [A-Fa-f0-9] {3}) $file extension validation ^ ([a-zA-Z]\: |\)\\ ([^\] +\) * [^\\] \ /: *? "|] +\ .txt (l)? $judge IE version ^. * MSIE [5-8] (?:\. [0-9] +)? (?!. * Trident\ / [5-9]\ .0). * $full-width symbol / [\ uFF00-\ uFFFF] / half-width symbol / [\ u0000 -\ u00FF] /" what are the common JS regular expressions "? Thank you for your 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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