diff --git a/CHANGES b/CHANGES
index d4e8d2ea4..720e44dfd 100644
--- a/CHANGES
+++ b/CHANGES
@@ -89,6 +89,8 @@ Features added
 * #7103: linkcheck: writes all links to ``output.json``
 * #7025: html search: full text search can be disabled for individual document
   using ``:nosearch:`` file-wide metadata
+* #7293: html search: Allow to override JavaScript splitter via
+  ``SearchLanguage.js_splitter_code``
 * #7142: html theme: Add a theme option: ``pygments_dark_style`` to switch the
   style of code-blocks in dark mode
 
diff --git a/sphinx/search/__init__.py b/sphinx/search/__init__.py
index aab4297a0..d9853ff06 100644
--- a/sphinx/search/__init__.py
+++ b/sphinx/search/__init__.py
@@ -43,6 +43,14 @@ class SearchLanguage:
        This is a set of stop words of the target language.  Default `stopwords`
        is empty.  This word is used for building index and embedded in JS.
 
+    .. attribute:: js_splitter_code
+
+       Return splitter funcion of JavaScript version.  The function should be
+       named as ``splitQuery``.  And it should take a string and return list of
+       strings.
+
+       .. versionadded:: 3.0
+
     .. attribute:: js_stemmer_code
 
        Return stemmer class of JavaScript version.  This class' name should be
@@ -55,6 +63,7 @@ class SearchLanguage:
     lang = None                 # type: str
     language_name = None        # type: str
     stopwords = set()           # type: Set[str]
+    js_splitter_code = None     # type: str
     js_stemmer_rawcode = None   # type: str
     js_stemmer_code = """
 /**
@@ -425,11 +434,16 @@ class IndexBuilder:
                 self._mapping.setdefault(stemmed_word, set()).add(docname)
 
     def context_for_searchtool(self) -> Dict[str, Any]:
+        if self.lang.js_splitter_code:
+            js_splitter_code = self.lang.js_splitter_code
+        else:
+            js_splitter_code = self.js_splitter_code
+
         return {
             'search_language_stemming_code': self.lang.js_stemmer_code,
             'search_language_stop_words': jsdump.dumps(sorted(self.lang.stopwords)),
             'search_scorer_tool': self.js_scorer_code,
-            'search_word_splitter_code': self.js_splitter_code,
+            'search_word_splitter_code': js_splitter_code,
         }
 
     def get_js_stemmer_rawcode(self) -> str: