Case-insensitive add_rewrite_rules in WordPress functions

As the answer below mentions, it is not possible to pass a flag to add_rewrite_rule(); however, it is possible to use an inline modifier. In your example, you would do this:

$aNewRules = array('(?i)my-books/?$' => 'index.php?pagename=my-books');

(note the (?i) in the regular expression).

The advantage of this approach is that your rewrite rules are much cleaner and more performant.

See this page on regular expression modifiers for more information.

Related Posts:

  1. When should add_rewrite_tag() be used?
  2. Why does everybody hook add_rewrite_rule on init
  3. add_rewrite_rule() vs $wp_rewrite->rules vs ‘rewrite_rules_array’?
  4. How to check if a rewrite rule exists
  5. Custom post types and custom variables — add_rewrite_tag() question
  6. add_rewrite_rule not producing anything in $_GET
  7. Flush_rewrite_rules not working when settings updated
  8. Does add_rewrite_rule(..) only accept “index.php” as redirect target?
  9. Cyrillic characters in rewrite rules cause 404 Not Found errors
  10. Custom Endpoint Gives 404 Header
  11. Clean URLs for custom $_GET variables
  12. flush_rewrite_rules() cancels the effect of add_rewrite_rule()
  13. why is are these rewrite_tags and rules not working?
  14. Separate posts by chapter per rewrite
  15. resolve /author/ to a page or archive (of all authors) template
  16. Multiple values in a rewrite rule, is it possible?
  17. What add_rewrite_tag()’s RegEx matches against?
  18. add_feed and flush_rewrite_rules
  19. add_rewrite_rule parameter is not received by the page
  20. add_rewrite_rules prefix everything
  21. Can someone explain the function of the third parameter of “add_rewrite_tag”
  22. get_query_var with add_rewrite_rule and add_filter(‘query_vars’) not working
  23. Reading Settings -> Front Page displays “Static Page” being reset
  24. add_rewrite_rule query_var not being set
  25. why does add_rewrite_rule refresh and loose url variables
  26. add_rewrite_rule isnt working, not getting added to rules array, why?
  27. Associate the “add_rewrite_endpoint” and “$_GET”
  28. Custom Rewrite rule to match anything not already matched by WordPress
  29. Add Rewrite Endpoint to CPT Archive
  30. Optional all capture groups in rewrite rule
  31. Rewrite rule : custom post type with 2 numeric variiables
  32. Does it still make sense using json endpoint ep_mask now that there’s the new rest api? [closed]
  33. Simple page URL rewrite with add_rewrite_rule()
  34. Hooking “delete_option_rewrite_rules” for rewrite rule addition
  35. Optimal code for two add_rewrite_rule’s
  36. Custom URL rewrites work, but break my permalinks
  37. WordPress shows front page, when it should show 404 with pagination style urls
  38. add_rewrite_rule – Additional subpages for author pages
  39. Rewrite rule problem
  40. How do I flush rewrite rules
  41. add_rewrite_rule redirects if value = 1
  42. Pass query vars to front page
  43. rewrite url in wordpress
  44. add_rewrite_rule permalinks break in WordPress 4.5
  45. Rewrite rule for path of favicon.ico ( Add_rewrite_rule function possible ? )
  46. FLUSH_REWRITE_RULES – after or before REGISTER_POST_TYPE?
  47. Using get_query_var() from a plugin
  48. How to flush rewrite rules on the activation of any plugin
  49. Rewrite without query parameter
  50. WordPress CPT slug and page slug conflicts
  51. Mod_rewritte – remove ?m=1 from url
  52. Rewrite Rule for Post Meta
  53. WooCommerce – Conditional for page created by rewrite_rule
  54. custom permalink for single post category
  55. WordPress rewrite does not work for some reason
  56. Rewrite rules priority
  57. Rewrite rules ignored
  58. How do I turn off the blog and archives?
  59. Add_rewrite_rule doesn’t seem to work?
  60. Grab last part of the url inside rule
  61. Leverage WP_Rewrite to pre-validate links / detect invalid links
  62. When request has multiple matching rewrite rules, and matched rule returns 404 – iterate to next rewrite rule
  63. WordPress add a rewrite rule to a page to accept a GET variable
  64. “/” URLs without trailing slash shows 404
  65. How can I resolve search error with pagination wordpress
  66. CPT – Nice url with add_rewrite_rule
  67. get_author_posts_url() doesn’t return the author URL, because of wrong author_structure
  68. add_rewrite_rule only works when flush first
  69. Homepage rewrite rule
  70. WordPress add_rewrite_rule with 2 variables
  71. Rewrite rule not working, issue may be in URI request
  72. custom rewrite rules will not be added to wordpress rewrite_rules database
  73. rewrite rules problem with #comments-2345
  74. Overcoming a complex WordPress page rewrite rules request
  75. Why isn’t my rewrite rule for add_rewrite_rule not working as expected?
  76. Custom Fields Query Vars and Rewrite not working
  77. Rewrite Rules, Query Vars and Pagination
  78. A part of regular expression in add_rewrite_rule function not working
  79. How to change URL in WordPress
  80. WordPress Rewrite rule with custom query var
  81. How to add rewrite rule to point to file
  82. Complex rewrite rules with multiple variables, some the same
  83. Last query_var not working with rewritten URL
  84. Rewire Rules Front Page
  85. How to use endpoint, but remove/rewrite endpoint base?
  86. WordPress URL rewrite after changing web from Joomla
  87. add_rewrite_rule doesn’t work for me
  88. Rewritten URL not loading WordPress environment
  89. WordPress Custom post type single page 404 error
  90. Rewriting base name Taxonomy same Post Type
  91. Where to hook to bypass instantiating WP_Query?
  92. Rewrite the WordPress URL from custom plugin
  93. add_rewrite_rule works only with one “directory”
  94. How to Add Rewrite Ruled Argument Into Permalink Properly
  95. Overwrite WP’s default search rule to redirect to my own template
  96. add_rewrite_rule() driving me crazy, rewrite not working when analyzer says it should
  97. Redirect to a file in a WordPress theme directory
  98. What is the `rewrite_rules` option the options table in the WordPress database?
  99. Rewrite rule to index.php in theme subfolder
  100. rewriteRules WP6

Leave a Comment