How to test valid UUID/GUID?

Currently, UUID’s are as specified in RFC4122. An often neglected edge case is the NIL UUID, noted here. The following regex takes this into account and will return a match for a NIL UUID. See below for a UUID which only accepts non-NIL UUIDs. Both of these solutions are for versions 1 to 5 (see the first character of the third block).

Therefore to validate a UUID…

/^[0-9a-f]{8}-[0-9a-f]{4}-[0-5][0-9a-f]{3}-[089ab][0-9a-f]{3}-[0-9a-f]{12}$/i

…ensures you have a canonically formatted UUID that is Version 1 through 5 and is the appropriate Variant as per RFC4122.

NOTE: Braces { and } are not canonical. They are an artifact of some systems and usages.

Easy to modify the above regex to meet the requirements of the original question.

HINT: regex group/captures

To avoid matching NIL UUID:

/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i

Related Posts:

  1. How to create a GUID / UUID
  2. Javascript split regex question
  3. Reactjs – Form input validation
  4. What is a good regular expression to match a URL? [duplicate]
  5. What is a good regular expression to match a URL? [duplicate]
  6. Is there a difference between /\s/g and /\s+/g?
  7. RegEx Ignore Case
  8. JavaScript replace/regex
  9. How to validate an email address in JavaScript
  10. Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters
  11. Escaping Discord subset of markdown
  12. Regular expression : match either of two conditions?
  13. RegExp in TypeScript
  14. How to validate date with format “mm/dd/yyyy” in JavaScript?
  15. Converting any string into camel case
  16. I want to remove double quotes from a String
  17. Validate date in dd/mm/yyyy format using JQuery Validate
  18. Regular expression for removing whitespaces
  19. How can I check if a string is a valid number?
  20. Javascript Regular Expression Remove Spaces
  21. How can I extract a number from a string in JavaScript?
  22. What is jQuery Unobtrusive Validation?
  23. Remove not alphanumeric characters from string
  24. Extract hostname name from string
  25. Difference between ?:, ?! and ?=
  26. Remove all special characters with RegExp
  27. How do you use a variable in a regular expression?
  28. How to count string occurrence in string?
  29. Regular Expression to reformat a US phone number in Javascript
  30. Jquery Value match Regex
  31. RegEx: How can I match all numbers greater than 49?
  32. Regular expression to validate US phone numbers?
  33. ZIP Code (US Postal Code) validation
  34. javascript includes() case insensitive
  35. RegEx for Javascript to allow only alphanumeric
  36. Check user logged in with JS
  37. Remove type attribute from script added by wp_localize_script
  38. Custom Block – save.js function not saving attributes
  39. How to validate image with specific height and width selection in media selector
  40. Remove WordPress default registration client side validation?
  41. Block pattern conflict with custom block
  42. Can I use complex HTML with Twitter Bootstrap’s Tooltip?
  43. How do I redirect to another webpage?
  44. Invariant Violation: Objects are not valid as a React child
  45. How can I merge properties of two JavaScript objects dynamically?
  46. JavaScript TypeError: Cannot read property ‘style’ of null
  47. Invalid shorthand property initializer
  48. nodejs – error self signed certificate in certificate chain
  49. How do I loop through or enumerate a JavaScript object?
  50. Getting Unexpected Token Export
  51. How can I print using JQuery
  52. Short circuit Array.forEach like calling break
  53. javascript HTML from document.body.innerHTML
  54. How to send an email from JavaScript
  55. MissingSchemaError: Schema hasn’t been registered for model “User”
  56. classical inheritance vs prototypal inheritance in javascript
  57. Uncaught TypeError: Cannot read property ‘value’ of null
  58. Async/await in componentDidMount to load in correct order
  59. Dynamically load JS inside JS
  60. Tainted canvases may not be exported
  61. How to open a URL in a new Tab using JavaScript or jQuery?
  62. How to sort an object array by date property?
  63. React router not showing browser history
  64. How to define DO NOTHING in JavaScript
  65. How to get the difference between two arrays in JavaScript?
  66. What happened to Lodash _.pluck?
  67. Simplest/cleanest way to implement a singleton in JavaScript
  68. What counts as CPU Intensive tasks (eg. sorting, searching etc?)
  69. HTML make text clickable without making it a hyperlink
  70. Uncaught ReferenceError: React is not defined
  71. How to get the browser viewport dimensions?
  72. Getting HTML form values
  73. How to fix javascript .toFixed is not a Function error
  74. jQuery checkbox checked state changed event
  75. Javascript, viewing [object HTMLInputElement]
  76. Why onbeforeunload event is not firing
  77. etect the Enter key in a text input field
  78. Include Javascript as Plain (No file inclusion)
  79. Adding wp_ajax to a theme outside functions.php (on specific template page)
  80. Insert shortcode in post editor from javascript (Visual / HTML)
  81. Provide specific example for block variation
  82. Block editor: How to check if block editor has initialized and populated the data store?
  83. Contact Form 7 – Give each checkbox a class?
  84. Custom wp.editor.initialize settings ignored
  85. Why my javascript code not working for the dashboard of wordpress admin?
  86. Detect When User Reads Full Article? [closed]
  87. How to add classes and events to image in javascript using Gutenberg?
  88. Adding Code into Theme Customizer Header
  89. Javascript in wordpress
  90. How to inherit custom javascript from parent to child pages?
  91. imporing HTML+javascript from REST API
  92. how to add a custom javascript file to our theme
  93. Why does my array sort order changes when I pass it to JS using WP_REST_Response?
  94. WordPress Guternberg Content For React Native
  95. Custom block update rendering when reused
  96. How do I add my own scripts to the add_action(‘wp_enqueue_scripts’) function?
  97. contact form 7 javascript and wpcf7_before_send_mail action
  98. Embed Kajabi into WP
  99. How to load JavaScript modules with script_loader_tag hook?
  100. How to securely set dynamic HTML content with JavaScript?

Leave a Comment