Regular Expressions 101

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Regular Expression
Created·2025-03-05 07:59
Flavor·ECMAScript (JavaScript)

((?:^(?:[#*=-]{1,7}|\w[^\r\n]{0,200}\r?\n[-=]{2,200}|<h[1-6][^>]{0,100}>)[^\r\n]{1,200}(?:<\/h[1-6]>)?(?:\r?\n|$))|(?:\[[0-9]+\][^\r\n]{1,800})|(?:(?:^|\r?\n)[ \t]{0,3}(?:[-*+•]|\d{1,3}\.\w\.|\[[ xX]\])[ \t]+(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,200}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,200}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*(?:(?:\r?\n[ \t]{2,5}(?:[-*+•]|\d{1,3}\.\w\.|\[[ xX]\])[ \t]+(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,200}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,200}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*){0,6}(?:\r?\n[ \t]{4,7}(?:[-*+•]|\d{1,3}\.\w\.|\[[ xX]\])[ \t]+(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,200}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,200}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*){0,6})?)|(?:(?:^>(?:>|\s{2,}){0,2}(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,200}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,200}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*\r?\n?){1,15})|(?:(?:^|\r?\n)(?:```|~~~)(?:\w{0,20})?\r?\n[\s\S]{0,1500}?(?:```|~~~)\r?\n?|(?:(?:^|\r?\n)(?: {4}|\t)[^\r\n]{0,200}(?:\r?\n(?: {4}|\t)[^\r\n]{0,200}){0,20}\r?\n?)|(?:<pre>(?:<code>)?[\s\S]{0,1500}?(?:<\/code>)?<\/pre>))|(?:(?:^|\r?\n)(?:\|[^\r\n]{0,200}\|(?:\r?\n\|[-:]{1,200}\|){0,1}(?:\r?\n\|[^\r\n]{0,200}\|){0,20}|<table>[\s\S]{0,2000}?<\/table>))|(?:^(?:[-*_]){3,}\s*$|<hr\s*\/?>)|(?![\s\]})>,'])(?:^(?:<[a-zA-Z][^>]{0,100}>)?(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,800}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,800}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*(?:<\/[a-zA-Z]+>)?(?:\r?\n|$))|(?![\s\]})>,'])(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,400}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,400}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*|(?:(?<!\w)"""[^"]{0,300}"""(?!\w)|(?<!\w)(?:['"`'"])[^\r\n]{0,300}\1(?!\w)|(?<!\w)`[^\r\n]{0,300}'(?!\w)|(?<!\w)``[^\r\n]{0,300}''(?!\w)|$[^\r\n()]{0,200}(?:\([^\r\n()]{0,200}$[^\r\n()]{0,200}){0,5}\)|\[[^\r\n\[\]]{0,200}(?:\[[^\r\n\[\]]{0,200}\][^\r\n\[\]]{0,200}){0,5}\]|\$[^\r\n$]{0,100}\$|`[^`\r\n]{0,100}`)|(?![\s\]})>,'])(?:(?:^|\r?\n\r?\n)(?:<p>)?(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,1000}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,1000}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*(?:<\/p>)?(?=\r?\n\r?\n|$))|(?:<[a-zA-Z][^>]{0,100}(?:>[\s\S]{0,1000}?<\/[a-zA-Z]+>|\s*\/>))|(?:(?:\$\$[\s\S]{0,500}?\$\$)|(?:\$[^\$\r\n]{0,100}\$))|(?![\s\]})>,'])(?![.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]\s)(?:[^\r\n]{1,800}(?:(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)|(?=[\r\n]|$))|[^\r\n]{1,800}(?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]|(?:'(?=`)|''(?=``)))(?:(?:(?!(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$)).){1,100}(?:[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}](?<![\s\]})>,'](?=[.!?…]|\.{3}|[\u2026\u2047-\u2049]|[\p{Emoji_Presentation}\p{Extended_Pictographic}]))|(?:'(?=`)|''(?=``)))(?=\S|$))?)[\s\]})>,']*)

gmu

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Description

Source: X, Github

Submitted by anonymous

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Community Patterns

ตรวจสอบพยัญชนะต้นตัวสะกดสระและวรรณยุกต์ไทย

Secure Email Validation (OWASP-Aligned & DNS-Strict) (RFC 5322)

URL, URI format validation

Regex Email Format

ตรวจสอบวรรณยุกต์และสระในภาษาไทย (รองรับการลากเสียงอาาาา)

ตรวจสอบวรรณยุกต์และสระในภาษาไทย

cApStAn OmegaT flagged / disallowed text

cApStAn OmegaT custom tags

Simple CSS Selector parser

Text in between HTML tags and inside quotation marks within HTML tags

Universal HTML <input type="email"... requirement pattern

IPv4 no leading zeros

普罗米修斯解析匹配

Only one special character("-") per word

Email validation regex

Integer Number

op

Detect age-related conversations.

Keep Talking and Nobody Explodes - Passwords

regex for '' deletion

Youtube URL / ID

Regex to match URLs in a string

https://google.com

BCP 47, RFC 5646, Tags for Identifying Languages

Deped LRN validator

gdpsfh anti-stupid

Bangla validation regex

OpenSearch + ElasticSearch minimum_should_match pattern

Jina AI tokenizer

argocd-vault-plugin

OGC Date-time parameter regex validator

Google Analytics 4 Ecommerce Events

Match camelCase file names. Allows numbers and [], [[]] as first chars.

Patu

Discord IP Blocker

Instagram Profile URL

Telegram URL

YYMMDD Date with leap year

Object Value JavaScript

Extract & Parse URLs (Dec. 2024)

Quality Value, RFC 9110 HTTP Semantics.

[React TypeScript] Unnecessary brackets around strings

[React TypeScript] Unnecessary backticks

Hexadecimal

Discord emoji & Markdown links

js-br

prevent double zeros

OBprefix

quote-OBprefix

AOC 2024 D3 regex