String &amp; Regex Validators

Capitalizes first letter of string.

#format#text

const capitalize = (str: string): string => str.charAt(0).toUpperCase() + str.slice(1);

Truncate String

Truncates string with ellipsis.

#format#text

const truncate = (str: string, len: number): string => str.length > len ? str.slice(0, len) + '...' : str;

Slugify String

Converts string to URL-friendly slug.

#url#seo

const slugify = (str: string): string => str.toLowerCase().trim().replace(/[^\w\s-]/g, '').replace(/[\s_-]+/g, '-');

Word Count

Counts words in a string.

#count#text

const wordCount = (str: string): number => str.trim().split(/\s+/).filter(Boolean).length;

Reverse String

Reverses a string.

#utility#text

const reverse = (str: string): string => str.split('').reverse().join('');

Is Palindrome

Checks if string reads same forwards and backwards.

#algorithm#text

const isPalindrome = (str: string): boolean => {
  const clean = str.toLowerCase().replace(/[^a-z0-9]/g, '');
  return clean === clean.split('').reverse().join('');
};

Strong Password

Min 8 chars, 1 upper, 1 lower, 1 num, 1 special.

#security#auth

const isValid = (s: string): boolean => /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/.test(s);

Moderate Password

Min 8 chars, 1 letter, 1 number.

#security#auth

const isValid = (s: string): boolean => /^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$/.test(s);

PIN (4 Digits)

Standard 4-digit PIN.

#auth#mobile

const isValid = (s: string): boolean => /^[0-9]{4}$/.test(s);

PIN (6 Digits)

Standard 6-digit PIN / OTP.

#auth#mobile#otp

const isValid = (s: string): boolean => /^[0-9]{6}$/.test(s);

Generic API Key

32+ alphanumeric characters.

#auth#token

const isValid = (s: string): boolean => /^[a-zA-Z0-9]{32,}$/.test(s);

Phone (E.164 Int)

International format (+14155552671).

#phone#contact

const isValid = (s: string): boolean => /^\+[1-9]\d{1,14}$/.test(s);

Phone (US)

Matches (555) 555-5555 or 555-555-5555.

#phone#us

const isValid = (s: string): boolean => /^\(?([2-9][0-9]{2})\)?[-. ]?([2-9][0-9]{2})[-. ]?([0-9]{4})$/.test(s);

Phone (UK Mobile)

UK Mobile number format.

#phone#uk

const isValid = (s: string): boolean => /^(\+44|0)7\d{9}$/.test(s);

Phone (India)

+91 or 10-digit mobile.

#phone#india

const isValid = (s: string): boolean => /^(\+91[\-\s]?)?[6-9]\d{9}$/.test(s);

Zip Code (US)

5 digit or 5+4 (12345-6789).

#address#us#postal

const isValid = (s: string): boolean => /^\d{5}(?:[-\s]\d{4})?$/.test(s);

Postcode (UK)

Standard UK postcode format.

#address#uk

const isValid = (s: string): boolean => /^[A-Z]{1,2}[0-9][A-Z0-9]? ?[0-9][A-Z]{2}$/.test(s);

Postcode (Canada)

Format A1A 1A1.

#address#canada

const isValid = (s: string): boolean => /^[ABCEGHJ-NPRSTVXY]\d[ABCEGHJ-NPRSTV-Z][ -]?\d[ABCEGHJ-NPRSTV-Z]\d$/.test(s);

Pincode (India)

6 digit pincode.

#address#india

const isValid = (s: string): boolean => /^[1-9][0-9]{5}$/.test(s);

Lat/Long Coordinates

Valid latitude, longitude pair.

#geo#map

const isValid = (s: string): boolean => /^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?),\s*[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$/.test(s);

Latitude Only

-90 to 90.

#geo

const isValid = (s: string): boolean => /^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?)$/.test(s);

Longitude Only

-180 to 180.

#geo

const isValid = (s: string): boolean => /^[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$/.test(s);

Username (Basic)

3-16 chars, alphanumeric, underscore, hyphen.

#web#auth

const isValid = (s: string): boolean => /^[a-z0-9_-]{3,16}$/.test(s);

Twitter Handle

Standard Twitter handle (w/ optional @).

#social

const isValid = (s: string): boolean => /^@?(\w){1,15}$/.test(s);

Hashtag

Valid social media hashtag.

#social

const isValid = (s: string): boolean => /^#[a-zA-Z0-9_]+$/.test(s);

YouTube Video ID

Extracts ID or validates URL.

#media#url

const isValid = (s: string): boolean => /^(?:https?:\/\/)?(?:www\.)?(?:youtube\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=)|youtu\.be\/)([a-zA-Z0-9_-]{11})/.test(s);

Email (Simple)

Common email validation (lighter than RFC).

#contact#web

const isValid = (s: string): boolean => /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/.test(s);

URL Slug

SEO-friendly URL part.

#web#seo

const isValid = (s: string): boolean => /^[a-z0-9]+(?:-[a-z0-9]+)*$/.test(s);

Hex Color

#RGB or #RRGGBB.

#css#design

const isValid = (s: string): boolean => /^#?([a-fA-F0-9]{3}|[a-fA-F0-9]{6})$/.test(s);

UUID (v4)

Universal Unique Identifier.

#id#db

const isValid = (s: string): boolean => /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/.test(s);

MD5 Hash

32 char hex hash.

#crypto#hash

const isValid = (s: string): boolean => /^[a-f0-9]{32}$/.test(s);

SHA256 Hash

64 char hex hash.

#crypto#hash

const isValid = (s: string): boolean => /^[a-f0-9]{64}$/.test(s);

Base64 String

Valid Base64 encoding.

#encoding

const isValid = (s: string): boolean => /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/.test(s);

JSON String (Simple)

Basic check for {} or [].

#data

const isValid = (s: string): boolean => /^[\[\{].*[\]\}]$/.test(s);

Alphabetic Only

A-Z case insensitive.

const isValid = (s: string): boolean => /^[a-zA-Z]+$/.test(s);

Alphanumeric

A-Z and 0-9.

const isValid = (s: string): boolean => /^[a-zA-Z0-9]+$/.test(s);

Numeric String

Digits only.

const isValid = (s: string): boolean => /^[0-9]+$/.test(s);

No Whitespace

Strings without spaces/tabs.

const isValid = (s: string): boolean => /^\S+$/.test(s);

Phone (Australia)

Australian mobile format.

#phone#australia

const isValid = (s: string): boolean => /^(\+61|0)4\d{8}$/.test(s);

Phone (Germany)

German phone format.

#phone#germany

const isValid = (s: string): boolean => /^(\+49|0)[1-9]\d{1,14}$/.test(s);

Phone (France)

French phone format.

#phone#france

const isValid = (s: string): boolean => /^(\+33|0)[1-9]\d{8}$/.test(s);

Phone (Japan)

Japanese phone format.

#phone#japan

const isValid = (s: string): boolean => /^(\+81|0)[789]0\d{8}$/.test(s);

Phone (Brazil)

Brazilian phone format.

#phone#brazil

const isValid = (s: string): boolean => /^(\+55)?\d{2}9?\d{8}$/.test(s);

Instagram Handle

Valid Instagram username.

#social#instagram

const isValid = (s: string): boolean => /^@?[a-zA-Z0-9._]{1,30}$/.test(s);

TikTok Handle

Valid TikTok username.

#social#tiktok

const isValid = (s: string): boolean => /^@?[a-zA-Z0-9._]{2,24}$/.test(s);

LinkedIn Profile URL

LinkedIn profile link.

#social#linkedin

const isValid = (s: string): boolean => /^https?:\/\/(www\.)?linkedin\.com\/in\/[a-zA-Z0-9_-]+\/?$/.test(s);

GitHub Username

Valid GitHub username.

#social#github

const isValid = (s: string): boolean => /^[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,37}[a-zA-Z0-9])?$/.test(s);

Discord Username

Discord username format.

#social#discord

const isValid = (s: string): boolean => /^.{2,32}#\d{4}$/.test(s);

Telegram Handle

Telegram username.

#social#telegram

const isValid = (s: string): boolean => /^@?[a-zA-Z][a-zA-Z0-9_]{4,31}$/.test(s);

Data URI

Base64 data URI format.

#encoding#uri

const isValid = (s: string): boolean => /^data:[a-zA-Z]+\/[a-zA-Z]+;base64,[A-Za-z0-9+/]+=*$/.test(s);

Magnet URI

Magnet link format.

#torrent#uri

const isValid = (s: string): boolean => /^magnet:\?xt=urn:[a-zA-Z0-9]+:[a-zA-Z0-9]+/.test(s);

RGB Color

rgb(255,255,255) format.

const isValid = (s: string): boolean => /^rgb\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)$/.test(s);

RGBA Color

rgba with alpha channel.

const isValid = (s: string): boolean => /^rgba\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(0|1|0?\.\d+)\s*\)$/.test(s);

HSL Color

hsl(360,100%,100%) format.

const isValid = (s: string): boolean => /^hsl\(\s*(\d{1,3})\s*,\s*(\d{1,3})%\s*,\s*(\d{1,3})%\s*\)$/.test(s);

Hex Color (8 digit)

#RRGGBBAA with alpha.

const isValid = (s: string): boolean => /^#[a-fA-F0-9]{8}$/.test(s);

Country Code (2-letter)

ISO 3166-1 alpha-2.

#country#iso

const isValid = (s: string): boolean => /^[A-Z]{2}$/.test(s);

Country Code (3-letter)

ISO 3166-1 alpha-3.

#country#iso

const isValid = (s: string): boolean => /^[A-Z]{3}$/.test(s);

Language Code

ISO 639-1 (e.g. en, fr).

#language#iso

const isValid = (s: string): boolean => /^[a-z]{2}(-[A-Z]{2})?$/.test(s);

Locale Code

Format: en_US, fr_FR.

#i18n#locale

const isValid = (s: string): boolean => /^[a-z]{2}(_[A-Z]{2})?$/.test(s);

ISBN-10

10-digit book identifier.

#book#isbn

const isValid = (s: string): boolean => /^\d{9}[\dXx]$/.test(s);

ISBN-13

13-digit book identifier.

#book#isbn

const isValid = (s: string): boolean => /^97[89]\d{10}$/.test(s);

EAN-13 Barcode

Product barcode.

#barcode#retail

const isValid = (s: string): boolean => /^\d{13}$/.test(s);

UPC-A Barcode

US product code.

#barcode#retail

const isValid = (s: string): boolean => /^\d{12}$/.test(s);

Amazon ASIN

Amazon product ID.

#amazon#product

const isValid = (s: string): boolean => /^B0[A-Z0-9]{8}$/.test(s);

CSS Class Name

Valid CSS class selector.

#css#frontend

const isValid = (s: string): boolean => /^-?[_a-zA-Z][_a-zA-Z0-9-]*$/.test(s);

HTML ID

Valid HTML id attribute.

#html#frontend

const isValid = (s: string): boolean => /^[a-zA-Z][a-zA-Z0-9_-]*$/.test(s);

CSS Unit

Valid CSS unit (px, em, rem, %).

#css#unit

const isValid = (s: string): boolean => /^-?\d+(\.\d+)?(px|em|rem|%|vh|vw|pt|cm|mm|in)$/.test(s);

Hex Opacity

00-FF opacity value.

#css#opacity

const isValid = (s: string): boolean => /^[0-9a-fA-F]{2}$/.test(s);

Environment Variable

Valid env var name.

#env#config

const isValid = (s: string): boolean => /^[A-Z][A-Z0-9_]*$/.test(s);

MIME Type

Valid MIME type format.

#mime#content

const isValid = (s: string): boolean => /^[a-z]+\/[a-z0-9.+-]+$/.test(s);

YouTube Channel ID

YouTube channel identifier.

#youtube#channel

const isValid = (s: string): boolean => /^UC[a-zA-Z0-9_-]{22}$/.test(s);

Spotify URI

Spotify resource URI.

#spotify#music

const isValid = (s: string): boolean => /^spotify:(track|album|artist|playlist):[a-zA-Z0-9]+$/.test(s);

Apple Music ID

Apple Music track ID.

#apple#music

const isValid = (s: string): boolean => /^\d{9,12}$/.test(s);

Phone (Mexico)

Mexican phone format.

#phone#mexico

const isValid = (s: string): boolean => /^(\+52)?\d{10}$/.test(s);

Phone (South Korea)

Korean phone format.

#phone#korea

const isValid = (s: string): boolean => /^(\+82|0)1[0-9]\d{7,8}$/.test(s);

Phone (Russia)

Russian phone format.

#phone#russia

const isValid = (s: string): boolean => /^(\+7|8)?\d{10}$/.test(s);

Phone (Italy)

Italian phone format.

#phone#italy

const isValid = (s: string): boolean => /^(\+39)?3\d{9}$/.test(s);

Phone (Spain)

Spanish phone format.

#phone#spain

const isValid = (s: string): boolean => /^(\+34)?[6-9]\d{8}$/.test(s);

Phone (Netherlands)

Dutch phone format.

#phone#netherlands

const isValid = (s: string): boolean => /^(\+31|0)6\d{8}$/.test(s);

Phone (Poland)

Polish phone format.

#phone#poland

const isValid = (s: string): boolean => /^(\+48)?[5-9]\d{8}$/.test(s);

Phone (Sweden)

Swedish phone format.

#phone#sweden

const isValid = (s: string): boolean => /^(\+46|0)7\d{8}$/.test(s);

Phone (Switzerland)

Swiss phone format.

#phone#switzerland

const isValid = (s: string): boolean => /^(\+41|0)7[5-9]\d{7}$/.test(s);

Phone (UAE)

UAE phone format.

#phone#uae

const isValid = (s: string): boolean => /^(\+971|0)5[024568]\d{7}$/.test(s);

Phone (Singapore)

Singapore phone format.

#phone#singapore

const isValid = (s: string): boolean => /^(\+65)?[89]\d{7}$/.test(s);

Phone (South Africa)

South African phone format.

#phone#southafrica

const isValid = (s: string): boolean => /^(\+27|0)[6-8]\d{8}$/.test(s);

Phone (Nigeria)

Nigerian phone format.

#phone#nigeria

const isValid = (s: string): boolean => /^(\+234|0)[789]0\d{8}$/.test(s);

Phone (Egypt)

Egyptian phone format.

#phone#egypt

const isValid = (s: string): boolean => /^(\+20|0)1[0125]\d{8}$/.test(s);

Phone (Pakistan)

Pakistani phone format.

#phone#pakistan

const isValid = (s: string): boolean => /^(\+92|0)3[0-9]{9}$/.test(s);

Pinterest Profile

Pinterest profile URL.

#social#pinterest

const isValid = (s: string): boolean => /^https?:\/\/(www\.)?pinterest\.(com|co\.uk)\/[a-zA-Z0-9_]+\/?$/.test(s);

Snapchat Username

Valid Snapchat username.

#social#snapchat

const isValid = (s: string): boolean => /^[a-zA-Z][a-zA-Z0-9._-]{2,14}$/.test(s);

Reddit Username

Reddit username format.

#social#reddit

const isValid = (s: string): boolean => /^u\/[a-zA-Z0-9_-]{3,20}$/.test(s);

Subreddit Name

Valid subreddit format.

#social#reddit

const isValid = (s: string): boolean => /^r\/[a-zA-Z0-9_]{3,21}$/.test(s);

Twitch Username

Valid Twitch username.

#social#twitch

const isValid = (s: string): boolean => /^[a-zA-Z0-9_]{4,25}$/.test(s);

Medium Handle

Medium username format.

#social#medium

const isValid = (s: string): boolean => /^@[a-zA-Z0-9._]+$/.test(s);

Mastodon Handle

Mastodon username@instance.

#social#mastodon

const isValid = (s: string): boolean => /^@[a-zA-Z0-9_]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/.test(s);

Bluesky Handle

Bluesky username format.

#social#bluesky

const isValid = (s: string): boolean => /^@?[a-zA-Z0-9.-]+\.bsky\.social$/.test(s);

Threads Handle

Instagram Threads username.

#social#threads

const isValid = (s: string): boolean => /^@?[a-zA-Z0-9._]{1,30}$/.test(s);

Facebook Page URL

Facebook page link.

#social#facebook

const isValid = (s: string): boolean => /^https?:\/\/(www\.)?facebook\.com\/[a-zA-Z0-9.]+\/?$/.test(s);

ICD-10 Code

Medical diagnosis code.

#healthcare#medical

const isValid = (s: string): boolean => /^[A-Z][0-9]{2}(\.[0-9A-Z]{1,4})?$/.test(s);

SNOMED CT

Clinical terminology code.

#healthcare#medical

const isValid = (s: string): boolean => /^\d{6,18}$/.test(s);

RxNorm Code

Drug identifier code.

#healthcare#pharmacy

const isValid = (s: string): boolean => /^\d{1,7}$/.test(s);

NDC Code

National Drug Code.

#healthcare#pharmacy

const isValid = (s: string): boolean => /^\d{4,5}-\d{3,4}-\d{1,2}$/.test(s);

Course Code

University course code.

#education#course

const isValid = (s: string): boolean => /^[A-Z]{2,4}\s?\d{3,4}[A-Z]?$/.test(s);

GPA

Grade point average 0.0-4.0.

#education#grade

const isValid = (s: string): boolean => /^[0-4]\.[0-9]{1,2}$/.test(s);

SAT Score

SAT score 400-1600.

#education#test

const isValid = (s: string): boolean => /^(1[0-5][0-9]{2}|1600|[4-9][0-9]{2})$/.test(s);

SKU

Stock Keeping Unit.

#ecommerce#product

const isValid = (s: string): boolean => /^[A-Z0-9]{6,20}$/.test(s);

Order ID

E-commerce order format.

#ecommerce#order

const isValid = (s: string): boolean => /^ORD-\d{8,12}$/.test(s);

UPS Tracking

UPS tracking number.

#shipping#ups

const isValid = (s: string): boolean => /^1Z[A-Z0-9]{16}$/.test(s);

FedEx Tracking

FedEx tracking number.

#shipping#fedex

const isValid = (s: string): boolean => /^[0-9]{12,22}$/.test(s);

USPS Tracking

USPS tracking number.

#shipping#usps

const isValid = (s: string): boolean => /^(94|93|92|91|[0-9]{20})\d{18,22}$/.test(s);

Promo Code

Promotional code format.

#ecommerce#discount

const isValid = (s: string): boolean => /^[A-Z0-9]{4,16}$/.test(s);

Coupon Code

Coupon format.

#ecommerce#discount

const isValid = (s: string): boolean => /^[A-Z]{2,4}-[A-Z0-9]{4,8}$/.test(s);

Steam ID

Steam user ID.

#gaming#steam

const isValid = (s: string): boolean => /^STEAM_[0-5]:[01]:\d+$/.test(s);

Steam ID (64-bit)

64-bit Steam ID.

#gaming#steam

const isValid = (s: string): boolean => /^7656119\d{10}$/.test(s);

Xbox Gamertag

Xbox Live gamertag.

#gaming#xbox

const isValid = (s: string): boolean => /^[a-zA-Z][a-zA-Z0-9]{0,14}$/.test(s);

PSN ID

PlayStation Network ID.

#gaming#playstation

const isValid = (s: string): boolean => /^[a-zA-Z][a-zA-Z0-9_-]{2,15}$/.test(s);

Nintendo Friend Code

Nintendo Switch friend code.

#gaming#nintendo

const isValid = (s: string): boolean => /^SW-\d{4}-\d{4}-\d{4}$/.test(s);

Epic Games ID

Epic Games username.

#gaming#epic

const isValid = (s: string): boolean => /^[a-zA-Z0-9_-]{3,16}$/.test(s);

Riot ID

Riot Games ID format.

#gaming#riot

const isValid = (s: string): boolean => /^[a-zA-Z0-9_]{3,16}#[a-zA-Z0-9]{3,5}$/.test(s);

WhatsApp Link

WhatsApp click-to-chat.

#messaging#whatsapp

const isValid = (s: string): boolean => /^https?:\/\/(wa\.me|api\.whatsapp\.com)\/[0-9]+$/.test(s);

Signal Number

Signal phone format.

#messaging#signal

const isValid = (s: string): boolean => /^\+[1-9]\d{6,14}$/.test(s);

Slack Channel

Slack channel name.

#messaging#slack

const isValid = (s: string): boolean => /^#?[a-z0-9][a-z0-9_-]{0,79}$/.test(s);

Slack User ID

Slack user identifier.

#messaging#slack

const isValid = (s: string): boolean => /^[UW][A-Z0-9]{8,}$/.test(s);

Teams Meeting URL

Microsoft Teams meeting.

#messaging#teams

const isValid = (s: string): boolean => /^https:\/\/teams\.microsoft\.com\/l\/meetup-join\/.+$/.test(s);

Zoom Meeting ID

Zoom meeting identifier.

#messaging#zoom

const isValid = (s: string): boolean => /^\d{9,11}$/.test(s);

IATA Airport Code

3-letter airport code.

#travel#airport

const isValid = (s: string): boolean => /^[A-Z]{3}$/.test(s);

ICAO Airport Code

4-letter airport code.

#travel#airport

const isValid = (s: string): boolean => /^[A-Z]{4}$/.test(s);

Flight Number

Airline flight number.

#travel#airline

const isValid = (s: string): boolean => /^[A-Z]{2}\d{1,4}$/.test(s);

PNR Code

Passenger Name Record.

#travel#booking

const isValid = (s: string): boolean => /^[A-Z0-9]{6}$/.test(s);

E-Ticket Number

13-digit e-ticket.

#travel#airline

const isValid = (s: string): boolean => /^\d{13}$/.test(s);

Frequent Flyer Number

Loyalty program ID.

#travel#loyalty

const isValid = (s: string): boolean => /^[A-Z]{2}\d{8,12}$/.test(s);

DOI

Digital Object Identifier.

#science#publication

const isValid = (s: string): boolean => /^10\.\d{4,9}\/[-._;()/:A-Z0-9]+$/.test(s);

PubMed ID

PubMed article identifier.

#science#medical

const isValid = (s: string): boolean => /^\d{1,8}$/.test(s);

arXiv ID

arXiv paper identifier.

#science#paper

const isValid = (s: string): boolean => /^\d{4}\.\d{4,5}(v\d+)?$/.test(s);

Chemical Formula

Basic chemical formula.

#science#chemistry

const isValid = (s: string): boolean => /^[A-Z][a-z]?(\d+)?([A-Z][a-z]?(\d+)?)*$/.test(s);

CAS Number

Chemical registry number.

#science#chemistry

const isValid = (s: string): boolean => /^\d{2,7}-\d{2}-\d$/.test(s);

InChI Key

Chemical identifier key.

#science#chemistry

const isValid = (s: string): boolean => /^[A-Z]{14}-[A-Z]{10}-[A-Z]$/.test(s);

Case Number (US)

Federal court case.

#legal#court

const isValid = (s: string): boolean => /^\d{1,2}:\d{2}-[a-z]{2}-\d{4,5}$/.test(s);

Patent Number (US)

US patent number.

#legal#patent

const isValid = (s: string): boolean => /^(US)?\d{7,8}$/.test(s);

Trademark Number

USPTO trademark.

#legal#trademark

const isValid = (s: string): boolean => /^\d{7,8}$/.test(s);

Aspect Ratio

Video aspect ratio.

#video#media

const isValid = (s: string): boolean => /^\d+:\d+$/.test(s);

Resolution

Video resolution.

#video#media

const isValid = (s: string): boolean => /^\d{3,4}x\d{3,4}$/.test(s);

Frame Rate

FPS format.

#video#media

const isValid = (s: string): boolean => /^\d{1,3}(\.\d+)?\s?fps$/.test(s);

Bitrate

Bitrate format.

#audio#media

const isValid = (s: string): boolean => /^\d+\s?(kbps|mbps|Kbps|Mbps)$/.test(s);

SMPTE Timecode

HH:MM:SS:FF format.

#video#timecode

const isValid = (s: string): boolean => /^\d{2}:\d{2}:\d{2}:\d{2}$/.test(s);

Audio Duration

MM:SS format.

#audio#duration

const isValid = (s: string): boolean => /^\d{1,3}:\d{2}$/.test(s);

CSS Color Name

Named CSS color.

const isValid = (s: string): boolean => /^(red|blue|green|yellow|black|white|gray|grey|orange|purple|pink|brown|cyan|magenta)$/.test(s);

Mobile User Agent

Mobile browser detection.

#browser#mobile

const isValid = (s: string): boolean => /(Android|iPhone|iPad|iPod|Mobile)/.test(s);

Bot User Agent

Search engine bot.

#browser#bot

const isValid = (s: string): boolean => /(Googlebot|Bingbot|Slurp|DuckDuckBot|Baiduspider)/.test(s);

Windows Version

Windows version string.

#os#windows

const isValid = (s: string): boolean => /^Windows\s(10|11|NT\s\d+\.\d+)$/.test(s);

macOS Version

macOS version string.

#os#macos

const isValid = (s: string): boolean => /^(Mac\s)?OS\sX?\s?1[0-5]\.\d+$/.test(s);

iOS Version

iOS version format.

#os#ios

const isValid = (s: string): boolean => /^iOS\s1[0-7]\.\d+$/.test(s);

Android Version

Android version.

#os#android

const isValid = (s: string): boolean => /^Android\s1[0-4]$/.test(s);

Disposable Email

Temp email domains.

#email#spam

const isValid = (s: string): boolean => /@(tempmail|guerrillamail|10minutemail|mailinator|throwaway)\./.test(s);

Corporate Email

Business email format.

#email#business

const isValid = (s: string): boolean => /^[a-zA-Z0-9._%+-]+@(?!gmail|yahoo|hotmail|outlook)[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/.test(s);

Educational Email

.edu email address.

#email#education

const isValid = (s: string): boolean => /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.edu$/.test(s);

Government Email

.gov email address.

#email#government

const isValid = (s: string): boolean => /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.gov$/.test(s);

YAML Key

Valid YAML key.

#config#yaml

const isValid = (s: string): boolean => /^[a-zA-Z_][a-zA-Z0-9_]*$/.test(s);

TOML Key

Valid TOML key.

#config#toml

const isValid = (s: string): boolean => /^[a-zA-Z0-9_-]+$/.test(s);

INI Section

INI file section.

#config#ini

const isValid = (s: string): boolean => /^\[[a-zA-Z0-9_]+\]$/.test(s);

Dotenv Variable

.env variable name.

#config#env

const isValid = (s: string): boolean => /^[A-Z][A-Z0-9_]*$/.test(s);

NPM Package Name

Valid npm package.

#npm#package

const isValid = (s: string): boolean => /^(@[a-z0-9-~][a-z0-9-._~]*\/)?[a-z0-9-~][a-z0-9-._~]*$/.test(s);

PyPI Package Name

Valid Python package.

#python#package

const isValid = (s: string): boolean => /^[a-zA-Z0-9]([a-zA-Z0-9._-]*[a-zA-Z0-9])?$/.test(s);

Ruby Gem Name

Valid gem name.

#ruby#package

const isValid = (s: string): boolean => /^[a-z][a-z0-9_-]*$/.test(s);

Cargo Crate Name

Valid Rust crate.

#rust#package

const isValid = (s: string): boolean => /^[a-z][a-z0-9_-]*$/.test(s);

Maven Artifact ID

Maven artifact format.

#java#package

const isValid = (s: string): boolean => /^[a-z][a-z0-9-]*$/.test(s);

NuGet Package

Valid NuGet package.

#dotnet#package

const isValid = (s: string): boolean => /^[a-zA-Z0-9.]+$/.test(s);

Log Level

Standard log levels.

#logging#level

const isValid = (s: string): boolean => /^(DEBUG|INFO|WARN|WARNING|ERROR|FATAL|CRITICAL)$/.test(s);

Syslog Priority

Syslog priority format.

#logging#syslog

const isValid = (s: string): boolean => /^<\d{1,3}>$/.test(s);

Boolean String

String boolean value.

#validation#boolean

const isValid = (s: string): boolean => /^(true|false|yes|no|1|0)$/.test(s);

Nullable String

Null-like string values.

#validation#null

const isValid = (s: string): boolean => /^(null|nil|none|undefined|)$/.test(s);

Hex String