diff --git a/.github/workflows/test_preprocessor.yml b/.github/workflows/test_preprocessor.yml
index ec20067..8a73dec 100644
--- a/.github/workflows/test_preprocessor.yml
+++ b/.github/workflows/test_preprocessor.yml
@@ -2,7 +2,8 @@ name: Test Preprocessor
 on: [push, pull_request]
 
 env:
-  GODOT_EXECUTABLE: Godot_v${{ vars.GODOT_VERSION }}_linux.x86_64
+  GODOT_VERSION: 4.1.3-stable
+  GODOT_EXECUTABLE: Godot_v${{ env.GODOT_VERSION }}_linux.x86_64
 
 jobs:
   test-preprocessor:
@@ -19,12 +20,12 @@ jobs:
           cache-name: cache-godot
         with:
           path: ./${{ env.GODOT_EXECUTABLE }}
-          key: ${{ runner.os }}-${{ env.cache-name }}-${{ vars.GODOT_VERSION }}
+          key: ${{ runner.os }}-${{ env.cache-name }}-${{ env.GODOT_VERSION }}
 
       - if: ${{ steps.cache-godot.outputs.cache-hit != 'true' }}
         name: Install Godot
         run: |
-          wget -q https://github.com/godotengine/godot-builds/releases/download/${{ vars.GODOT_VERSION }}/${{ env.GODOT_EXECUTABLE }}.zip
+          wget -q https://github.com/godotengine/godot-builds/releases/download/${{ env.GODOT_VERSION }}/${{ env.GODOT_EXECUTABLE }}.zip
           unzip ${{ env.GODOT_EXECUTABLE }}.zip
 
       - name: Run tests
diff --git a/README.md b/README.md
index d69d2a6..b1de285 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 An export plugin for stripping comments and "conditional compilation" of GDScript.
 
-Compatible with Godot 4.2.
+Compatible with Godot 4.1.
 
 ## How to use
 
diff --git a/addons/gdscript_preprocessor/export_plugin.gd b/addons/gdscript_preprocessor/export_plugin.gd
index e0adbc9..42e965a 100644
--- a/addons/gdscript_preprocessor/export_plugin.gd
+++ b/addons/gdscript_preprocessor/export_plugin.gd
@@ -1,7 +1,6 @@
 extends EditorExportPlugin
 
 
-@warning_ignore("inferred_declaration")
 const _Preprocessor = preload("./preprocessor.gd")
 
 var _config_path: String
@@ -37,7 +36,7 @@ func _export_begin(
 		regex = _get_option(config, "statements", "removing_regex_debug", "")
 	else:
 		regex = _get_option(config, "statements", "removing_regex_release",
-				r"^(?:breakpoint|assert\(|print_debug\(|print_stack\()")
+				"^(?:breakpoint|assert\\(|print_debug\\(|print_stack\\()")
 	if not regex.is_empty():
 		_preprocessor.statement_removing_regex = RegEx.create_from_string(regex)
 		if not _preprocessor.statement_removing_regex.is_valid():
diff --git a/addons/gdscript_preprocessor/plugin.gd b/addons/gdscript_preprocessor/plugin.gd
index 501e4db..6bdf8f5 100644
--- a/addons/gdscript_preprocessor/plugin.gd
+++ b/addons/gdscript_preprocessor/plugin.gd
@@ -2,7 +2,6 @@
 extends EditorPlugin
 
 
-@warning_ignore("inferred_declaration")
 const _ExportPlugin = preload("./export_plugin.gd")
 
 var _export_plugin: _ExportPlugin = _ExportPlugin.new()
diff --git a/addons/gdscript_preprocessor/preprocessor.gd b/addons/gdscript_preprocessor/preprocessor.gd
index 08ba6a6..e82087a 100644
--- a/addons/gdscript_preprocessor/preprocessor.gd
+++ b/addons/gdscript_preprocessor/preprocessor.gd
@@ -29,7 +29,6 @@ const _PAREN_CLOSE:   int = 0x0029 # ")"
 const _BRACKET_OPEN:  int = 0x005B # "["
 const _BACKSLASH:     int = 0x005C # "\\"
 const _BRACKET_CLOSE: int = 0x005D # "]"
-const _SMALL_R:       int = 0x0072 # "r"
 const _BRACE_OPEN:    int = 0x007B # "{"
 const _BRACE_CLOSE:   int = 0x007D # "}"
 
@@ -63,9 +62,9 @@ var _output_enabled: bool = true
 var _paren_stack: Array[int]
 
 var _os_has_feature_regex: RegEx = RegEx.create_from_string(
-		r"""OS\.has_feature\((["'])(\w+)\1\)""")
+		"""OS\\.has_feature\\((["'])(\\w+)\\1\\)""")
 var _cond_regex: RegEx = RegEx.create_from_string(
-		r"^(false|true|and|or|not|&&|\|\||!|\(|\)| |\t|\r|\n)+$")
+		"^(false|true|and|or|not|&&|\\|\\||!|\\(|\\)| |\\t|\\r|\\n)+$")
 var _expression: Expression = Expression.new()
 
 
@@ -187,17 +186,9 @@ func _parse_statement() -> void:
 				return
 			_position += 1
 		elif c == _QUOT or c == _APOS:
-			_parse_string(false)
+			_parse_string()
 			if not error_message.is_empty():
 				return
-		elif c == _SMALL_R:
-			_position += 1
-			if _position < _length:
-				var q: int = _source.unicode_at(_position)
-				if q == _QUOT or q == _APOS:
-					_parse_string(true)
-					if not error_message.is_empty():
-						return
 		elif c == _HASH:
 			# Skip comment.
 			string += _source.substr(from, _position - from)
@@ -324,7 +315,7 @@ func _parse_statement() -> void:
 		current_block.status = _Status.NORMAL
 
 
-func _parse_string(is_raw: bool) -> void:
+func _parse_string() -> void:
 	var quote_char: int = _source.unicode_at(_position)
 	_position += 1
 
@@ -346,15 +337,10 @@ func _parse_string(is_raw: bool) -> void:
 				error_message = "Unterminated string."
 				return
 			var esc: int = _source.unicode_at(_position)
-			if is_raw:
-				if esc == quote_char or esc == _BACKSLASH:
-					_position += 1
-				# else: **not** advance.
-			else:
-				# Let's assume the escape is valid.
-				_position += 1
-				if esc == _NEWLINE:
-					_line += 1
+			# Let's assume the escape is valid.
+			_position += 1
+			if esc == _NEWLINE:
+				_line += 1
 		elif c == quote_char:
 			_position += 1
 			if is_multiline:
@@ -380,7 +366,7 @@ func _eval_cond(cond: String) -> _Trilean:
 			.replace("OS.is_debug_build()", "true" if is_debug else "false")
 
 	var matches: Array[RegExMatch] = _os_has_feature_regex.search_all(cond)
-	for i: int in range(matches.size() - 1, -1, -1):
+	for i in range(matches.size() - 1, -1, -1):
 		var m: RegExMatch = matches[i]
 		cond = cond.left(m.get_start()) + ("true" if features.has(m.get_string(2)) else "false") \
 				+ cond.substr(m.get_end())
diff --git a/project.godot b/project.godot
index 8a747f9..96f224c 100644
--- a/project.godot
+++ b/project.godot
@@ -11,14 +11,12 @@ config_version=5
 [application]
 
 config/name="gdscript-preprocessor"
-config/features=PackedStringArray("4.2", "Forward Plus")
+config/features=PackedStringArray("4.1", "Forward Plus")
 config/icon="res://icon.png"
 
 [debug]
 
 gdscript/warnings/exclude_addons=false
-gdscript/warnings/untyped_declaration=1
-gdscript/warnings/inferred_declaration=1
 gdscript/warnings/unsafe_property_access=1
 gdscript/warnings/unsafe_method_access=1
 gdscript/warnings/unsafe_cast=1
diff --git a/test_runner.gd b/test_runner.gd
index 3d0c197..35e740b 100644
--- a/test_runner.gd
+++ b/test_runner.gd
@@ -1,14 +1,13 @@
 extends SceneTree
 
 
-@warning_ignore("inferred_declaration")
 const _Preprocessor = preload("./addons/gdscript_preprocessor/preprocessor.gd")
 
 var _preprocessor: _Preprocessor = _Preprocessor.new()
 
 
 func _init() -> void:
-	for file_name: String in DirAccess.get_files_at("tests/"):
+	for file_name in DirAccess.get_files_at("tests/"):
 		if not file_name.ends_with(".gd"):
 			continue
 
diff --git a/tests/strings.gd b/tests/strings.gd
index a46a880..8fa10ab 100644
--- a/tests/strings.gd
+++ b/tests/strings.gd
@@ -4,30 +4,6 @@ func test() -> void:
 	print("""test
 			test \n \" ' '' " "" \\""")
 
-	# https://github.com/godotengine/godot/blob/master/
-	# modules/gdscript/tests/scripts/parser/features/r_strings.gd
-	print(r"test ' \' \" \\ \n \t \u2023 test")
-	print(r"\n\\[\t ]*(\w+)")
-	print(r"")
-	print(r"\"")
-	print(r"\\\"")
-	print(r"\\")
-	print(r"\" \\\" \\\\\"")
-	print(r"\ \\ \\\ \\\\ \\\\\ \\")
-	print(r'"')
-	print(r'"(?:\\.|[^"])*"')
-	print(r"""""")
-	print(r"""test \t "test"="" " \" \\\" \ \\ \\\ test""")
-	print(r'''r"""test \t "test"="" " \" \\\" \ \\ \\\ test"""''')
-	print(r"\t
-			\t")
-	print(r"\t \
-			\t")
-	print(r"""\t
-			\t""")
-	print(r"""\t \
-			\t""")
-
 	if true:
 		if false:
 			print("test")
diff --git a/tests/strings.txt b/tests/strings.txt
index 7e9aac2..15f3684 100644
--- a/tests/strings.txt
+++ b/tests/strings.txt
@@ -4,26 +4,5 @@ func test() -> void:
 			test \n \" ' '' \\")
 	print("""test
 			test \n \" ' '' " "" \\""")
-	print(r"test ' \' \" \\ \n \t \u2023 test")
-	print(r"\n\\[\t ]*(\w+)")
-	print(r"")
-	print(r"\"")
-	print(r"\\\"")
-	print(r"\\")
-	print(r"\" \\\" \\\\\"")
-	print(r"\ \\ \\\ \\\\ \\\\\ \\")
-	print(r'"')
-	print(r'"(?:\\.|[^"])*"')
-	print(r"""""")
-	print(r"""test \t "test"="" " \" \\\" \ \\ \\\ test""")
-	print(r'''r"""test \t "test"="" " \" \\\" \ \\ \\\ test"""''')
-	print(r"\t
-			\t")
-	print(r"\t \
-			\t")
-	print(r"""\t
-			\t""")
-	print(r"""\t \
-			\t""")
 	if true:
 		pass