diff --git a/hio/lib/hio-utl.h b/hio/lib/hio-utl.h
index 71c3210..8d8d4ca 100644
--- a/hio/lib/hio-utl.h
+++ b/hio/lib/hio-utl.h
@@ -543,25 +543,25 @@ HIO_EXPORT const hio_uch_t* hio_find_ucstr_word_in_ucstr (
 	int              ignorecase
 );
 
-HIO_EXPORT hio_uch_t* hio_find_uchar_in_chars (
+HIO_EXPORT hio_uch_t* hio_find_uchar_in_uchars (
 	const hio_uch_t* ptr,
 	hio_oow_t        len,
 	hio_uch_t        c
 );
 
-HIO_EXPORT hio_bch_t* hio_find_bchar_in_chars (
+HIO_EXPORT hio_bch_t* hio_find_bchar_in_bchars (
 	const hio_bch_t* ptr,
 	hio_oow_t        len,
 	hio_bch_t        c
 );
 
-HIO_EXPORT hio_uch_t* hio_rfind_uchar_in_chars (
+HIO_EXPORT hio_uch_t* hio_rfind_uchar_in_uchars (
 	const hio_uch_t* ptr,
 	hio_oow_t        len,
 	hio_uch_t        c
 );
 
-HIO_EXPORT hio_bch_t* hio_rfind_bchar_in_chars (
+HIO_EXPORT hio_bch_t* hio_rfind_bchar_in_bchars (
 	const hio_bch_t* ptr,
 	hio_oow_t        len,
 	hio_bch_t        c
@@ -577,6 +577,48 @@ HIO_EXPORT hio_bch_t* hio_find_bchar_in_bcstr (
 	hio_bch_t        c
 );
 
+HIO_EXPORT hio_uch_t* hio_rfind_uchar_in_ucstr (
+	const hio_uch_t* ptr,
+	hio_uch_t        c
+);
+
+HIO_EXPORT hio_bch_t* hio_rfind_bchar_in_bcstr (
+	const hio_bch_t* ptr,
+	hio_bch_t        c
+);
+
+HIO_EXPORT hio_uch_t* hio_find_uchars_in_uchars (
+	const hio_uch_t* str,
+	hio_oow_t        strsz,
+	const hio_uch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
+HIO_EXPORT hio_bch_t* hio_find_bchars_in_bchars (
+	const hio_bch_t* str,
+	hio_oow_t        strsz,
+	const hio_bch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
+HIO_EXPORT hio_uch_t* hio_rfind_uchars_in_uchars (
+	const hio_uch_t* str,
+	hio_oow_t        strsz,
+	const hio_uch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
+HIO_EXPORT hio_bch_t* hio_rfind_bchars_in_bchars (
+	const hio_bch_t* str,
+	hio_oow_t        strsz,
+	const hio_bch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
 /* ------------------------------------ */
 
 HIO_EXPORT hio_oow_t hio_rotate_uchars (
diff --git a/hio/lib/hio-utl.h.m4 b/hio/lib/hio-utl.h.m4
index a6ceadc..b410a95 100644
--- a/hio/lib/hio-utl.h.m4
+++ b/hio/lib/hio-utl.h.m4
@@ -544,25 +544,25 @@ HIO_EXPORT const hio_uch_t* hio_find_ucstr_word_in_ucstr (
 	int              ignorecase
 );
 
-HIO_EXPORT hio_uch_t* hio_find_uchar_in_chars (
+HIO_EXPORT hio_uch_t* hio_find_uchar_in_uchars (
 	const hio_uch_t* ptr,
 	hio_oow_t        len,
 	hio_uch_t        c
 );
 
-HIO_EXPORT hio_bch_t* hio_find_bchar_in_chars (
+HIO_EXPORT hio_bch_t* hio_find_bchar_in_bchars (
 	const hio_bch_t* ptr,
 	hio_oow_t        len,
 	hio_bch_t        c
 );
 
-HIO_EXPORT hio_uch_t* hio_rfind_uchar_in_chars (
+HIO_EXPORT hio_uch_t* hio_rfind_uchar_in_uchars (
 	const hio_uch_t* ptr,
 	hio_oow_t        len,
 	hio_uch_t        c
 );
 
-HIO_EXPORT hio_bch_t* hio_rfind_bchar_in_chars (
+HIO_EXPORT hio_bch_t* hio_rfind_bchar_in_bchars (
 	const hio_bch_t* ptr,
 	hio_oow_t        len,
 	hio_bch_t        c
@@ -578,6 +578,48 @@ HIO_EXPORT hio_bch_t* hio_find_bchar_in_bcstr (
 	hio_bch_t        c
 );
 
+HIO_EXPORT hio_uch_t* hio_rfind_uchar_in_ucstr (
+	const hio_uch_t* ptr,
+	hio_uch_t        c
+);
+
+HIO_EXPORT hio_bch_t* hio_rfind_bchar_in_bcstr (
+	const hio_bch_t* ptr,
+	hio_bch_t        c
+);
+
+HIO_EXPORT hio_uch_t* hio_find_uchars_in_uchars (
+	const hio_uch_t* str,
+	hio_oow_t        strsz,
+	const hio_uch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
+HIO_EXPORT hio_bch_t* hio_find_bchars_in_bchars (
+	const hio_bch_t* str,
+	hio_oow_t        strsz,
+	const hio_bch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
+HIO_EXPORT hio_uch_t* hio_rfind_uchars_in_uchars (
+	const hio_uch_t* str,
+	hio_oow_t        strsz,
+	const hio_uch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
+HIO_EXPORT hio_bch_t* hio_rfind_bchars_in_bchars (
+	const hio_bch_t* str,
+	hio_oow_t        strsz,
+	const hio_bch_t* sub,
+	hio_oow_t        subsz,
+	int              inorecase
+);
+
 /* ------------------------------------ */
 
 HIO_EXPORT hio_oow_t hio_rotate_uchars (