Invalid characters in user name when registered

It’s WordPress.

You could hack into wp-includes/formatting.php and comment out the contents of the sanitize_user() function.

However, I don’t think that’s a good idea – it may compromize your site’s security, and special characters can always cause trouble…

And it’s never a good idea to hack into the core (maybe you can do it also with remove_action() – but I’m not very familiar with this).

Related Posts:

  1. (un)wptexturize() — is it possible?
  2. Limit the content entered by editor or admin in the WP admin editor window
  3. How do I remove weird characters in text?
  4. Greek characters only showing in certain circumstances
  5. Icons (non-Latin symbols) displaying incorrectly
  6. What’s the Max character limit for a post in WordPress?
  7. Words with special characters have dissapeared
  8. Search results doesn’t show with Turkish characters
  9. I submit a non-latin string value and it returns like %23%24%%%
  10. If a hacker changed the blog_charset to UTF-7 does that make WordPress vulnerable to further attacks?
  11. Strange characters – despite everything being UTF-8
  12. Wordspress add into my javascripts
  13. Problem with Hebrew characters in username
  14. excerpt in characters
  15. How to Add Customizer Setting in Child Theme
  16. Special characters in WordPress UTF-8 [closed]
  17. How can I stop TinyMCE from converting my HTML entities to characters?
  18. strange characters in wordpress website displayed for visitors [closed]
  19. How can I stop wp_update_post messing up HTML example code?
  20. Divide Post content into separate divs for every 500 characters (or any other character counts)
  21. Arabic Characters in URL returns 404 Error
  22. Set minimum number of characters in the search
  23. Remove empty lines ( ) when author updates their post
  24. How to limit the max number of characteres in the title that are displayed
  25. How to stop WordPress from changing ellipsis into a pre-composed triple-dot glyph?
  26. Adding “ ” before the last word in multiple defined areas with a plugin
  27. WordPress turns HTML code to HTML entities
  28. Character Encoding for wp_options
  29. Search and replace special characters (å,ä,ö) for image attachments only in database
  30. CPT Post Title Permalink: Replace “@” (or all special characters) with dash “-” instead of just removing
  31. apply_filters/do_action tag characters limit
  32. limit characters when posting from form
  33. Plugin To Insert Chinese Characters in Posts or Pages
  34. How do I shorten the title lenghs with Elementor theme? [closed]
  35. Hebrew Characters Have gone bad
  36. RewriteRule accepts numbers but not letters in tag
  37. Adding special characters to slug?
  38. why some permalinks adding characters/ruining links
  39. register_post_type name character limit
  40. Truncating varying lengths of information
  41. How can i preserve wordpress database encoding after using wp-cli search-replace with –export flag?
  42. Is there any way to use google input tool or any other language keyboard with WordPress [closed]
  43. Change/Replace keyboard character on keypress while writing new post
  44. Adding character count and limit in comments, modifying labels and fields – jetpack
  45. Migrated WordPress site renders Chinese
  46. Symbols such as £ end up being  in the database
  47. WordPress update messed special characters
  48. how to avoid the character conversion of WordPress pages?
  49. Show ellipsis (…) only if the number of characters exceeds limit defined in substr
  50. How can I allow Arabic usernames in WordPress
  51. Preg_Match(): compilation failed unknown property name
  52. “page not found” due to hat character (“^”) in a upload file name
  53. Check & remove special characters in a field?
  54. Ampersand breaking Widget title
  55. Restrict characters in comment section
  56. Function to replace comment’s accented characters before posting
  57. Unicode characters are saved in a funny way in the DB
  58. List first letter of categories – issue upon spcecial characters (danish letters)
  59. Toggle Shortcode Sanitize Title
  60. Fixed height of the_content()
  61. Search Character Set Problem
  62. A special character I am trying to include in a page keeps getting rejected with error “Updating failed. The response is not a valid JSON response.”
  63. How to remove special characters in post title
  64. How to Fix Mangled Thai Characters
  65. replace control character ascii into page
  66. Search issue on special Character
  67. WordPress Dutch characters encoding problem
  68. After migration, all featured images using accentued characters in their file names are displayed “blanked”
  69. Author name length character limit?
  70. Character encoding issue – black diamond question marks on imported post excerpts
  71. How to write in MySQL more characters in user_nicename
  72. character encoding problem in custom template
  73. WordPress character set issue
  74. Weird characters displayed when importing WordPress MySQL db
  75. Why is converting my database to UTF-8 truncating entries?
  76. How to prevent funny characters on Home Page
  77. What is zinging my HTML commands? I don’t think I can blame TinyMCE this time…
  78. How to Disable UNICODE slug?
  79. Post removes any text from post that’s following special characters
  80. Turkish Character Problem on mailing
  81. How to make sure the letters ‘pez’ do not convert to a fish symbol? [closed]
  82. Limit username to specific characters (A-Z and 0-9)
  83. Problem with removing characters “<” – WpAllImport
  84. Truncating characters in Advanced Custom Fields works some places but not others?
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)