diff --git a/Library/Homebrew/cmd/casks.sh b/Library/Homebrew/cmd/casks.sh
index aa3a75cf2bb2e..b39285b1de3f9 100644
--- a/Library/Homebrew/cmd/casks.sh
+++ b/Library/Homebrew/cmd/casks.sh
@@ -8,5 +8,5 @@
 source "${HOMEBREW_LIBRARY}/Homebrew/items.sh"
 
 homebrew-casks() {
-  homebrew-items 'Formula' 's|/Casks/|/|' '^homebrew/cask'
+  homebrew-items '*/Casks/*\.rb' '' 's|/Casks/|/|' '^homebrew/cask'
 }
diff --git a/Library/Homebrew/cmd/formulae.sh b/Library/Homebrew/cmd/formulae.sh
index ccf04ea0766b8..649af45c9e4ed 100644
--- a/Library/Homebrew/cmd/formulae.sh
+++ b/Library/Homebrew/cmd/formulae.sh
@@ -8,5 +8,5 @@
 source "${HOMEBREW_LIBRARY}/Homebrew/items.sh"
 
 homebrew-formulae() {
-  homebrew-items 'Casks' 's|/Formula/|/|' '^homebrew/core'
+  homebrew-items '*\.rb' 'Casks' 's|/Formula/|/|' '^homebrew/core'
 }
diff --git a/Library/Homebrew/items.sh b/Library/Homebrew/items.sh
index 838ef5f6e2363..4a655897315f9 100644
--- a/Library/Homebrew/items.sh
+++ b/Library/Homebrew/items.sh
@@ -1,9 +1,10 @@
 homebrew-items() {
   local items
   local sed_extended_regex_flag
-  local find_filter="$1"
-  local sed_filter="$2"
-  local grep_filter="$3"
+  local find_include_filter="$1"
+  local find_exclude_filter="$2"
+  local sed_filter="$3"
+  local grep_filter="$4"
 
   # HOMEBREW_MACOS is set by brew.sh
   # shellcheck disable=SC2154
@@ -19,14 +20,14 @@ homebrew-items() {
   items="$(
     find "${HOMEBREW_REPOSITORY}/Library/Taps" \
       -type d \( \
-      -name "${find_filter}" -o \
+      -name "${find_exclude_filter}" -o \
       -name cmd -o \
       -name .github -o \
       -name lib -o \
       -name spec -o \
       -name vendor \
       \) \
-      -prune -false -o -name '*\.rb' |
+      -prune -false -o -path "${find_include_filter}" |
       sed "${sed_extended_regex_flag}" \
         -e 's/\.rb//g' \
         -e 's_.*/Taps/(.*)/(home|linux)brew-_\1/_' \