Common Regular Expressions

Table of Contents

Line with certain chars

//e.g. line contains "hostlike" (?<=^)[^\n]*?hostlike[^\n]*(?=$)

All Letters in all languages (Except 2E00 - 2FFF):

\p{L}

Chinese chars:

\p{Han}

Punctuations (Chinese and English):

\p{P}

e.g. (punctuation + some special chars) (matched in PHP, C#):
!"#%&'()*,-./:;?@[\]_{}¡§«·»¿;։֊؊٫٬‘’‚‛“”„‟′″‴‵‶‷%‰‱ 、。〃〈〉《》「」『』【】〔〕〖〗〘〙〚〛〜〝〞〟〰゠・ ︐︑︒︓︔︕︖︗︘︙﹅﹆﹇﹈﹉﹊﹋﹌﹍﹎﹏﹐﹑﹒﹙﹚﹛﹜﹝﹞﹟﹠﹡﹣（）＊，－．／：；？＠［＼］＿｛｝｟｠｡｢｣､･ —―‖‗†‡•‣․‥…‧‸‹›※‼‽‾‿⁀⁁⁂⁃⁄⁅⁆⁇⁈⁉⁊¶⁋⁌⁍⁎⁏⁐⁑⁓⁔⁕⁖⁗⁘⁙⁚⁛⁜⁝⁞〈〉⌈⌉⌊⌋❨❩❪❫❬❭❮❯❰❱❲❳❴❵⟅⟆⟦⟧⟨⟩⟪⟫⟬⟭⟮⟯⦃⦄⦅⦆⦇⦈⦉⦊⦋⦌⦍⦎⦏⦐⦑⦒⦓⦔⦕⦖⦗⦘⧘⧙⧚⧛⧼⧽⳹⳺⳻⳼⳾⳿⸀⸁⸂⸃⸄⸅⸆⸇⸈⸉⸊⸋⸌⸍⸎⸏⸐⸑⸒⸓⸔⸕⸖⸗⸘⸙⸚⸛⸜⸝⸞⸟⸠⸡⸢⸣⸤⸥⸦⸧⸨⸩⸪⸫⸬⸭⸮ⸯ⸰⸱⸲⸳⸴⸵⸶⸷⸸⸹⸼⸽⸾⸿⹀⹁⹂

All HTML tags:

</?\w.*?>

All HTML attributes:

\s+\w+=[\w\W\s]+?(?=>)

URL

(https?:)?\/\/(www\.)?[\d\w.-]{2,256}\.\w{2,6}\/[\p{L}@:%_.~#?&=\d\w\-\+\/]*

Email

\b[\d\w._%+-]+@[\d\w.-]+\.[\w]{2,6}\b

Phone Number

North America

(\+?\d{1,2})?[-. ]?\(?\d{3}\)?[-. ]?\d{3}[-. ]?\d{4}

Credit Card# (from stackoverflow)

Amex Card: ^3[47]\d{13}$
BCGlobal: ^(6541|6556)\d{12}$
Carte Blanche Card: ^389\d{11}$
Diners Club Card: ^3(?:0[0-5]|[68]\d)\d{11}$
Discover Card: ^65[4-9]\d{13}|64[4-9]\d{13}|6011\d{12}|(622(?:12[6-9]|1[3-9]\d|[2-8]\d\d|9[01]\d|92[0-5])\d{10})$
Insta Payment Card: ^63[7-9]\d{13}$
JCB Card: ^(?:2131|1800|35\d{3})\d{11}$
KoreanLocalCard: ^9\d{15}$
Laser Card: ^(6304|6706|6709|6771)\d{12,15}$
Maestro Card: ^(5018|5020|5038|6304|6759|6761|6763)\d{8,15}$
Mastercard: ^(5[1-5]\d{14}|2(22[1-9]\d{12}|2[3-9]\d{13}|[3-6]\d{14}|7[0-1]\d{13}|720\d{12}))$
Solo Card: ^(6334|6767)\d{12}|(6334|6767)\d{14}|(6334|6767)\d{15}$
Switch Card: ^(4903|4905|4911|4936|6333|6759)\d{12}|(4903|4905|4911|4936|6333|6759)\d{14}|(4903|4905|4911|4936|6333|6759)\d{15}|564182\d{10}|564182\d{12}|564182\d{13}|633110\d{10}|633110\d{12}|633110\d{13}$
Union Pay Card: ^(62\d{14,17})$
Visa Card: ^4\d{12}(?:\d{3})?$
Visa Master Card: ^(?:4\d{12}(?:\d{3})?|5[1-5]\d{14})$

Remove all non-digits from the string, then use this for Visa, MasterCard, American Express, Diners Club, Discover, and JCB cards:

^(?:4[0-9]{12}(?:[0-9]{3})?|[25][1-7][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11})$

As of 2016-10-14 the MasterCard regex here will be insufficient as they will be adding a new range of 222100-272099. I just added the following for our validation (Slagmoth):

^(?:5[1-5][0-9]\d{1}|222[1-9]|2[3-6][0-9]\d{1}|27[01][0-9]|2720)([\ \-]?)\d{4}\1\d{4}\1\d{4}$

Note: Switch hasn't existed since 2002, Laser was withdrawn in 2014, Visa are due to issue 19 digit cards and MasterCard are now issuing in the 2xxxxx ranges.

Ref:

https://stackoverflow.com/questions/9315647/regex-credit-card-number-tests
https://www.regular-expressions.info/creditcard.html
https://web.archive.org/web/20180904130300/https://creditcardjs.com/credit-card-type-detection