diff --git a/vlib/builtin/js/string.js.v b/vlib/builtin/js/string.js.v
index ee9246bb482462..303b33f19e8685 100644
--- a/vlib/builtin/js/string.js.v
+++ b/vlib/builtin/js/string.js.v
@@ -765,6 +765,26 @@ pub fn (s string) last_index(needle string) ?int {
 	return idx
 }
 
+// index_u8_last returns the index of the *last* occurrence of the byte `c` (if found) in the string.
+// It returns -1, if `c` is not found.
+@[deprecated: 'use `.last_index_u8(c u8)` instead']
+@[deprecated_after: '2024-06-30']
+@[inline]
+pub fn (s string) index_u8_last(c u8) int {
+	return s.last_index_u8(c)
+}
+
+// last_index_u8 returns the index of the last occurrence of byte `c` if it was found in the string.
+@[direct_array_access]
+pub fn (s string) last_index_u8(c u8) int {
+	for i := s.len - 1; i >= 0; i-- {
+		if s[i] == c {
+			return i
+		}
+	}
+	return -1
+}
+
 pub fn (s string) trim_space() string {
 	res := ''
 	#res.str = s.str.trim()
@@ -977,27 +997,6 @@ pub fn (s string) index(search string) ?int {
 	return res
 }
 
-// index_u8_last returns the index of the *last* occurrence of the byte `c` (if found) in the string.
-// It returns -1, if `c` is not found.
-@[direct_array_access]
-pub fn (s string) index_u8_last(c u8) int {
-	for i := s.len - 1; i >= 0; i-- {
-		if s[i] == c {
-			return i
-		}
-	}
-	return -1
-}
-
-// last_index_u8 returns the index of the last occurrence of byte `c` if found in the string.
-// It returns -1, if the byte `c` is not found.
-@[deprecated: 'use `.index_u8_last(c u8)` instead']
-@[deprecated_after: '2023-12-18']
-@[inline]
-pub fn (s string) last_index_u8(c u8) int {
-	return s.index_u8_last(c)
-}
-
 pub fn (_rune string) utf32_code() int {
 	res := 0
 	#res.val = s.str.charCodeAt()
diff --git a/vlib/builtin/string.v b/vlib/builtin/string.v
index f96d1754fc83b9..28019b8a579841 100644
--- a/vlib/builtin/string.v
+++ b/vlib/builtin/string.v
@@ -1340,25 +1340,24 @@ pub fn (s string) index_u8(c u8) int {
 
 // index_u8_last returns the index of the *last* occurrence of the byte `c` (if found) in the string.
 // It returns -1, if `c` is not found.
-@[direct_array_access]
+@[deprecated: 'use `.last_index_u8(c u8)` instead']
+@[deprecated_after: '2024-06-30']
+@[inline]
 pub fn (s string) index_u8_last(c u8) int {
+	return s.last_index_u8(c)
+}
+
+// last_index_u8 returns the index of the last occurrence of byte `c` if it was found in the string.
+@[inline]
+pub fn (s string) last_index_u8(c u8) int {
 	for i := s.len - 1; i >= 0; i-- {
-		if unsafe { s.str[i] == c } {
+		if s[i] == c {
 			return i
 		}
 	}
 	return -1
 }
 
-// last_index_u8 returns the index of the last occurrence of byte `c` if found in the string.
-// It returns -1, if the byte `c` is not found.
-@[deprecated: 'use `.index_u8_last(c u8)` instead']
-@[deprecated_after: '2023-12-18']
-@[inline]
-pub fn (s string) last_index_u8(c u8) int {
-	return s.index_u8_last(c)
-}
-
 // count returns the number of occurrences of `substr` in the string.
 // count returns -1 if no `substr` could be found.
 @[direct_array_access]
diff --git a/vlib/builtin/string_test.v b/vlib/builtin/string_test.v
index df08729c43a422..bb556cc565cf21 100644
--- a/vlib/builtin/string_test.v
+++ b/vlib/builtin/string_test.v
@@ -1490,7 +1490,7 @@ fn test_index_u8() {
 	//
 }
 
-fn test_index_last() {
+fn test_last_index() {
 	assert 'abcabca'.last_index('ca')? == 5
 	assert 'abcabca'.last_index('ab')? == 3
 	assert 'abcabca'.last_index('b')? == 4
@@ -1500,16 +1500,16 @@ fn test_index_last() {
 	// TODO: `assert 'Zabcabca'.index_last('Y') == none` is a cgen error, 2023/12/04
 }
 
-fn test_index_u8_last() {
-	assert 'abcabca'.index_u8_last(`a`) == 6
-	assert 'abcabca'.index_u8_last(`c`) == 5
-	assert 'abcabca'.index_u8_last(`b`) == 4
-	assert 'Zabcabca'.index_u8_last(`Z`) == 0
+fn test_last_index_u8() {
+	assert 'abcabca'.last_index_u8(`a`) == 6
+	assert 'abcabca'.last_index_u8(`c`) == 5
+	assert 'abcabca'.last_index_u8(`b`) == 4
+	assert 'Zabcabca'.last_index_u8(`Z`) == 0
 	//
-	assert 'abc'.index_u8(`d`) == -1
-	assert 'abc'.index_u8(`A`) == -1
-	assert 'abc'.index_u8(`B`) == -1
-	assert 'abc'.index_u8(`C`) == -1
+	assert 'abc'.last_index_u8(`d`) == -1
+	assert 'abc'.last_index_u8(`A`) == -1
+	assert 'abc'.last_index_u8(`B`) == -1
+	assert 'abc'.last_index_u8(`C`) == -1
 }
 
 fn test_contains_byte() {
diff --git a/vlib/net/urllib/urllib.v b/vlib/net/urllib/urllib.v
index 3743181339f99c..94927d9024c631 100644
--- a/vlib/net/urllib/urllib.v
+++ b/vlib/net/urllib/urllib.v
@@ -534,7 +534,7 @@ struct ParseAuthorityRes {
 }
 
 fn parse_authority(authority string) !ParseAuthorityRes {
-	i := authority.index_u8_last(`@`)
+	i := authority.last_index_u8(`@`)
 	if i < 0 {
 		return ParseAuthorityRes{
 			host: parse_host(authority)!
@@ -564,7 +564,7 @@ fn parse_host(host string) !string {
 	if host.len > 0 && host[0] == `[` {
 		// parse an IP-Literal in RFC 3986 and RFC 6874.
 		// E.g., '[fe80::1]', '[fe80::1%25en0]', '[fe80::1]:80'.
-		i := host.index_u8_last(`]`)
+		i := host.last_index_u8(`]`)
 		if i == -1 {
 			return error(error_msg("parse_host: missing ']' in host", ''))
 		}
@@ -586,7 +586,7 @@ fn parse_host(host string) !string {
 			return host1 + host2 + host3
 		}
 	} else {
-		i := host.index_u8_last(`:`)
+		i := host.last_index_u8(`:`)
 		if i != -1 {
 			colon_port := host[i..]
 			if !valid_optional_port(colon_port) {
@@ -859,7 +859,7 @@ fn resolve_path(base string, ref string) string {
 	if ref == '' {
 		full = base
 	} else if ref[0] != `/` {
-		i := base.index_u8_last(`/`)
+		i := base.last_index_u8(`/`)
 		full = base[..i + 1] + ref
 	} else {
 		full = ref
@@ -993,7 +993,7 @@ pub fn (u &URL) port() string {
 pub fn split_host_port(hostport string) (string, string) {
 	mut host := hostport
 	mut port := ''
-	colon := host.index_u8_last(`:`)
+	colon := host.last_index_u8(`:`)
 	if colon != -1 {
 		if valid_optional_port(host[colon..]) {
 			port = host[colon + 1..]
diff --git a/vlib/os/os.v b/vlib/os/os.v
index 63173568378d38..bac3a50b9a85df 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -266,7 +266,7 @@ pub fn file_ext(opath string) string {
 		return ''
 	}
 	path := file_name(opath)
-	pos := path.index_u8_last(`.`)
+	pos := path.last_index_u8(`.`)
 	if pos == -1 {
 		return ''
 	}
diff --git a/vlib/semver/parse.v b/vlib/semver/parse.v
index 7ec07962fc18cf..34816389ac3bdd 100644
--- a/vlib/semver/parse.v
+++ b/vlib/semver/parse.v
@@ -19,7 +19,7 @@ fn parse(input string) RawVersion {
 	mut raw_version := input
 	mut prerelease := ''
 	mut metadata := ''
-	plus_idx := raw_version.index_u8_last(`+`)
+	plus_idx := raw_version.last_index_u8(`+`)
 	if plus_idx > 0 {
 		metadata = raw_version[(plus_idx + 1)..]
 		raw_version = raw_version[0..plus_idx]
diff --git a/vlib/v/checker/struct.v b/vlib/v/checker/struct.v
index 2de80b5516633e..6b17e8ae0309d1 100644
--- a/vlib/v/checker/struct.v
+++ b/vlib/v/checker/struct.v
@@ -449,7 +449,7 @@ fn (mut c Checker) struct_init(mut node ast.StructInit, is_field_zero_struct_ini
 	// but `x := T{}` is ok.
 	if !c.is_builtin_mod && !c.inside_unsafe && type_sym.language == .v
 		&& c.table.cur_concrete_types.len == 0 {
-		pos := type_sym.name.index_u8_last(`.`)
+		pos := type_sym.name.last_index_u8(`.`)
 		first_letter := type_sym.name[pos + 1]
 		if !first_letter.is_capital() && (type_sym.kind != .struct_
 			|| !(type_sym.info is ast.Struct && type_sym.info.is_anon))
diff --git a/vlib/v/gen/js/js.v b/vlib/v/gen/js/js.v
index 99b2ef4d1cca51..ccb83a0433f1f4 100644
--- a/vlib/v/gen/js/js.v
+++ b/vlib/v/gen/js/js.v
@@ -302,7 +302,7 @@ pub fn gen(files []&ast.File, mut table ast.Table, pref_ &pref.Preferences) stri
 				current_segment := g.out.substr(int(sm_pos), int(sourcemap_ns_entry.ns_pos))
 				current_line += u32(current_segment.count('\n'))
 				mut current_column := u32(0)
-				last_nl_pos := current_segment.index_u8_last(`\n`)
+				last_nl_pos := current_segment.last_index_u8(`\n`)
 				if last_nl_pos != -1 {
 					current_column = u32(current_segment.len - last_nl_pos - 1)
 				}
@@ -536,7 +536,7 @@ pub fn (mut g JsGen) new_tmp_var() string {
 // 'fn' => ''
 @[inline]
 fn get_ns(s string) string {
-	idx := s.index_u8_last(`.`)
+	idx := s.last_index_u8(`.`)
 	if idx == -1 {
 		return ''
 	}