diff --git a/libaegisub/lua/script_reader.cpp b/libaegisub/lua/script_reader.cpp
index 6270948ab..7730697fa 100644
--- a/libaegisub/lua/script_reader.cpp
+++ b/libaegisub/lua/script_reader.cpp
@@ -19,9 +19,9 @@
 #include "libaegisub/file_mapping.h"
 #include "libaegisub/log.h"
 #include "libaegisub/lua/utils.h"
+#include "libaegisub/split.h"
 
 #include <boost/algorithm/string/replace.hpp>
-#include <boost/tokenizer.hpp>
 #include <lauxlib.h>
 
 namespace agi { namespace lua {
@@ -83,9 +83,9 @@ namespace agi { namespace lua {
 		std::string package_paths(check_string(L, -1));
 		lua_pop(L, 2);
 
-		boost::char_separator<char> sep(";");
-		for (auto filename : boost::tokenizer<boost::char_separator<char>>(package_paths, sep)) {
-			boost::replace_all(filename, "?", module);
+		for (auto tok : agi::Split(package_paths, ';')) {
+			std::string filename;
+			boost::replace_all_copy(std::back_inserter(filename), tok, "?", module);
 
 			// If there's a .moon file at that path, load it instead of the
 			// .lua file
diff --git a/src/auto4_base.cpp b/src/auto4_base.cpp
index b5fa2e53d..649f04692 100644
--- a/src/auto4_base.cpp
+++ b/src/auto4_base.cpp
@@ -43,10 +43,10 @@
 #include <libaegisub/fs.h>
 #include <libaegisub/path.h>
 #include <libaegisub/make_unique.h>
+#include <libaegisub/split.h>
 
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/algorithm/string/trim.hpp>
-#include <boost/tokenizer.hpp>
 #include <future>
 
 #include <wx/dcmemory.h>
@@ -262,9 +262,8 @@ namespace Automation4 {
 		include_path.emplace_back(filename.parent_path());
 
 		std::string include_paths = OPT_GET("Path/Automation/Include")->GetString();
-		boost::char_separator<char> sep("|");
-		for (auto const& tok : boost::tokenizer<boost::char_separator<char>>(include_paths, sep)) {
-			auto path = config::path->Decode(tok);
+		for (auto tok : agi::Split(include_paths, '|')) {
+			auto path = config::path->Decode(agi::str(tok));
 			if (path.is_absolute() && agi::fs::DirectoryExists(path))
 				include_path.emplace_back(std::move(path));
 		}
@@ -323,9 +322,8 @@ namespace Automation4 {
 
 		std::vector<std::future<std::unique_ptr<Script>>> script_futures;
 
-		boost::char_separator<char> sep("|");
-		for (auto const& tok : boost::tokenizer<boost::char_separator<char>>(path, sep)) {
-			auto dirname = config::path->Decode(tok);
+		for (auto tok : agi::Split(path, '|')) {
+			auto dirname = config::path->Decode(agi::str(tok));
 			if (!agi::fs::DirectoryExists(dirname)) continue;
 
 			for (auto filename : agi::fs::DirectoryIterator(dirname, "*.*"))
@@ -372,11 +370,11 @@ namespace Automation4 {
 
 		auto autobasefn(OPT_GET("Path/Automation/Base")->GetString());
 
-		boost::char_separator<char> sep("|");
-		for (auto const& cur : boost::tokenizer<boost::char_separator<char>>(local_scripts, sep)) {
-			auto trimmed = boost::trim_copy(cur);
-			char first_char = trimmed[0];
-			trimmed.erase(0, 1);
+		for (auto tok : agi::Split(local_scripts, '|')) {
+			tok = boost::trim_copy(tok);
+			if (boost::size(tok) == 0) continue;
+			char first_char = tok[0];
+			std::string trimmed(begin(tok) + 1, end(tok));
 
 			agi::fs::path basepath;
 			if (first_char == '~') {
diff --git a/src/auto4_lua_dialog.cpp b/src/auto4_lua_dialog.cpp
index a8c7fe418..7985c49b9 100644
--- a/src/auto4_lua_dialog.cpp
+++ b/src/auto4_lua_dialog.cpp
@@ -42,11 +42,11 @@
 #include <libaegisub/log.h>
 #include <libaegisub/lua/utils.h>
 #include <libaegisub/make_unique.h>
+#include <libaegisub/split.h>
 
 #include <boost/algorithm/string/case_conv.hpp>
 #include <boost/range/adaptor/map.hpp>
 #include <boost/range/algorithm.hpp>
-#include <boost/tokenizer.hpp>
 #include <cfloat>
 #include <unordered_map>
 
@@ -533,13 +533,12 @@ namespace Automation4 {
 	}
 
 	void LuaDialog::Unserialise(const std::string &serialised) {
-		boost::char_separator<char> psep("|"), csep(":");
-		for (auto const& cur : boost::tokenizer<boost::char_separator<char>>(serialised, psep)) {
-			size_t pos = cur.find(':');
-			if (pos == std::string::npos) continue;
+		for (auto tok : agi::Split(serialised, '|')) {
+			auto pos = std::find(begin(tok), end(tok), ':');
+			if (pos == end(tok)) continue;
 
-			std::string name = inline_string_decode(cur.substr(0, pos));
-			std::string value = cur.substr(pos + 1);
+			std::string name = inline_string_decode(std::string(begin(tok), pos));
+			std::string value(pos + 1, end(tok));
 
 			// Hand value to all controls matching name
 			for (auto& control : controls) {
diff --git a/src/dialog_export.cpp b/src/dialog_export.cpp
index b0d543b10..d2584c528 100644
--- a/src/dialog_export.cpp
+++ b/src/dialog_export.cpp
@@ -37,10 +37,10 @@
 #include "utils.h"
 
 #include <libaegisub/charset_conv.h>
+#include <libaegisub/split.h>
 
 #include <algorithm>
 #include <boost/filesystem/path.hpp>
-#include <boost/tokenizer.hpp>
 #include <wx/button.h>
 #include <wx/dialog.h>
 #include <wx/checklst.h>
@@ -113,8 +113,7 @@ DialogExport::DialogExport(agi::Context *c)
 
 	// Get selected filters
 	std::string const& selected = c->ass->Properties.export_filters;
-	boost::char_separator<char> sep("|");
-	for (auto const& token : boost::tokenizer<boost::char_separator<char>>(selected, sep)) {
+	for (auto token : agi::Split(selected, '|')) {
 		auto it = find(begin(filters), end(filters), token);
 		if (it != end(filters))
 			filter_list->Check(distance(begin(filters), it));
diff --git a/src/spline.cpp b/src/spline.cpp
index a44b1ce4d..395bac084 100644
--- a/src/spline.cpp
+++ b/src/spline.cpp
@@ -36,9 +36,9 @@
 
 #include "visual_tool.h"
 
+#include <libaegisub/split.h>
 #include <libaegisub/util.h>
 
-#include <boost/tokenizer.hpp>
 #include <limits>
 
 Spline::Spline(const VisualToolBase &tl)
@@ -109,10 +109,9 @@ void Spline::DecodeFromAss(std::string const& str) {
 	Vector2D pt{0, 0};
 
 	// Tokenize the string
-	boost::char_separator<char> sep(" ");
-	for (auto const& token : boost::tokenizer<boost::char_separator<char>>(str, sep)) {
+	for (auto token : agi::Split(str, ' ')) {
 		double n;
-		if (agi::util::try_parse(token, &n)) {
+		if (agi::util::try_parse(agi::str(token), &n)) {
 			stack.push_back(n);
 
 			// Move