(font-lock-regexp-face): New face

* lisp/font-lock.el (font-lock-regexp-face): New face.

* lisp/progmodes/typescript-ts-mode.el
(typescript-ts-mode--font-lock-settings):
* lisp/progmodes/ruby-ts-mode.el (ruby-ts--font-lock-settings):
* lisp/progmodes/js.el (js--treesit-font-lock-settings):
Use it for regexps.

* etc/NEWS: Mention the addition.

etc/NEWS

@@ -798,6 +798,7 @@ filter/sentinel error has been handled.
 These faces are primarily meant for use with tree-sitter.  They are:
 'font-lock-bracket-face', 'font-lock-delimiter-face',
 'font-lock-escape-face', 'font-lock-number-face',
+'font-lock-regexp-face',
 'font-lock-misc-punctuation-face', 'font-lock-operator-face',
 'font-lock-property-face', and 'font-lock-punctuation-face'.
 

lisp/font-lock.el

@@ -2073,6 +2073,12 @@ as the constructs of Haddock, Javadoc and similar systems."
   "Font Lock mode face used to highlight preprocessor directives."
   :group 'font-lock-faces)
 
+(defface font-lock-regexp-face
+  '((t :inherit font-lock-string-face))
+  "Font Lock mode face used to highlight regexp literals."
+  :group 'font-lock-faces
+  :version "29.1")
+
 (defface font-lock-regexp-grouping-backslash
   '((t :inherit bold))
   "Font Lock mode face for backslashes in Lisp regexp grouping constructs."

lisp/progmodes/js.el

@@ -3498,7 +3498,7 @@ This function is intended for use in `after-change-functions'."
 
    :language 'javascript
    :feature 'string
-   '((regex pattern: (regex_pattern)) @font-lock-string-face
+   '((regex pattern: (regex_pattern)) @font-lock-regexp-face
      (string) @font-lock-string-face)
 
    :language 'javascript

lisp/progmodes/ruby-ts-mode.el

@@ -227,10 +227,8 @@ values of OVERRIDE"
    ;; Also before 'operator because % and / are operators
    :language language
    :feature 'regexp
-   ;; TODO: We probably need a separate face for regexps everywhere.
-   ;; Maybe another one for regexp delimiters as well.
-   '((regex "/" @font-lock-string-face)
-     (regex _ (string_content) @font-lock-string-face))
+   '((regex "/" @font-lock-regexp-face)
+     (regex _ (string_content) @font-lock-regexp-face))
 
    :language language
    :feature 'operator

lisp/progmodes/typescript-ts-mode.el

@@ -151,7 +151,7 @@ Argument LANGUAGE is either `typescript' or `tsx'."
    :language language
    :override t
    :feature 'string
-   `((regex pattern: (regex_pattern)) @font-lock-string-face
+   `((regex pattern: (regex_pattern)) @font-lock-regexp-face
      (string) @font-lock-string-face
      (template_string) @js--fontify-template-string
      (template_substitution ["${" "}"] @font-lock-misc-punctuation-face))