regex.js

// Will match dates with dashes, slashes or with spaces dd-mm-yyyy dd/mm/yyyy dd mm yyyy
/^(0?[1-9]|[12][0-9]|3[01])([ \/\-])(0?[1-9]|1[012])\2([0-9][0-9][0-9][0-9])$/

// Match times in 24 hour format
/([01]?[0-9]|2[0-3]):[0-5][0-9]/
  
// Will match a valid date and times in the ISO-8601 format, excludes durations.
/^(?![+-]?\d{4,5}-?(?:\d{2}|W\d{2})T)(?:|(\d{4}|[+-]\d{5})-?(?:|(0\d|1[0-2])(?:|-?([0-2]\d|3[0-1]))|([0-2]\d{2}|3[0-5]\d|36[0-6])|W([0-4]\d|5[0-3])(?:|-?([1-7])))(?:(?!\d)|T(?=\d)))(?:|([01]\d|2[0-4])(?:|:?([0-5]\d)(?:|:?([0-5]\d)(?:|\.(\d{3})))(?:|[zZ]|([+-](?:[01]\d|2[0-4]))(?:|:?([0-5]\d)))))$/
  
// Match opening and closing HTML tags with content between
/^<([a-z1-6]+)([^<]+)*(?:>(.*)<\/\1>| *\/>)$/
  
// A string between 3 and 16 characters, allowing alphanumeric characters and hyphens and underscores
/^[a-zA-Z0-9_-]{3,16}$/
  
// RGB hex colors
/^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/
  
// Match valid URL slugs
/^[a-z0-9-]+$/
  
// Verify that there is an @ symbol with something before it
/^.+@.+$/
  
// Match the src attribute of an HTML image tag
/^<\s*img[^>]+src\s*=\s*(["'])(.*?)\1[^>]*>$/
  
HTML tags

/^<([a-z1-6]+)([^<]+)*(?:>(.*)<\/\1>| *\/>)$/

Test string
URL Slug

/^[a-z0-9-]+$/

Test string
URL

/^(https?:\/\/)?([\da-z\.-]+)\.([a-z\.]{2,6})([\/\w \.-]*)*\/?$/

Test string
Positive Integer

/^\d+$/

Test string
Positive number

/^\d*\.?\d+$/

Test string
Phone number

/^\+?[\d\s]{3,}$/

Test string
ID of Youtube Channel

/https?:\/\/(www\.)?youtube.com\/channel\/UC([-_a-z0-9]{22})/i

Test string
U.S./Canadian ZIP/Postal Code

/(^\d{5}(-\d{4})?$)|(^[ABCEGHJKLMNPRSTVXY]{1}\d{1}[A-Z]{1} *\d{1}[A-Z]{1}\d{1}$)/

Test string
Time in 24-hour format

/([01]?[0-9]|2[0-3]):[0-5][0-9]/

Test string
Username

/^[a-zA-Z0-9_-]{3,16}$/

Test string
Email

/^.+@.+$/

Test string
IPv4 Address

/^(?:(?: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]?)$/

Test string
Negative Integer

/^-\d+$/

Test string
Negative number

/^-\d*\.?\d+$/

Test string
New line

/[\r\n]|$/

Test string
CSS comment

/\/\*[^*]*\*+([^\/*][^*]*\*+)*\//

Test string
Morse Code

/^[.-]{1,5}(?:[ \t]+[.-]{1,5})*(?:[ \t]+[.-]{1,5}(?:[ \t]+[.-]{1,5})*)*$/

Test string
Date and time in ISO-8601 format

/^(?![+-]?\d{4,5}-?(?:\d{2}|W\d{2})T)(?:|(\d{4}|[+-]\d{5})-?(?:|(0\d|1[0-2])(?:|-?([0-2]\d|3[0-1]))|([0-2]\d{2}|3[0-5]\d|36[0-6])|W([0-4]\d|5[0-3])(?:|-?([1-7])))(?:(?!\d)|T(?=\d)))(?:|([01]\d|2[0-4])(?:|:?([0-5]\d)(?:|:?([0-5]\d)(?:|\.(\d{3})))(?:|[zZ]|([+-](?:[01]\d|2[0-4]))(?:|:?([0-5]\d)))))$/

Test string
Hex Color Value

/^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/

Test string
SRC of image tag

/^<\s*img[^>]+src\s*=\s*(["'])(.*?)\1[^>]*>$/

Test string
IPv6 Address

/^(([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}:){1,2}(:[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]))$/

Test string
Integer

/^-?\d+$/

Test string
Positive or negative number

/^-?\d*\.?\d+$/

Test string
ID of Youtube video

/https?:\/\/(?:youtu\.be\/|(?:[a-z]{2,3}\.)?youtube\.com\/watch(?:\?|#\!)v=)([\w-]{11}).*/gi

Test string
Wordpress shortcodes

/^\[([a-z-_0-9]+)([^\[]+)*(?:\](.*)\[\/\1\]|\s+\/\])$/

Test string
Image shortcode

/\[img\](.*?)\[\/img\]/