diff --git a/addons/majority_judgment/MajorityJudgmentParticipant.gd b/addons/majority_judgment/MajorityJudgmentParticipant.gd
index 93c20b5..4ac01b5 100644
--- a/addons/majority_judgment/MajorityJudgmentParticipant.gd
+++ b/addons/majority_judgment/MajorityJudgmentParticipant.gd
@@ -18,8 +18,9 @@ static func make(__name):
 
 func set_name(__name:String) -> void:
 	var invalid = RegEx.new()
-#	invalid.compile("[^a-zA-Z0-9+._-]+")
-#	__name = invalid.sub(__name, '', true)
+	# Allow unicode letters and numbers only, with . and _ and -
+	invalid.compile("[^\\p{L}\\p{N}._-]+")
+	__name = invalid.sub(__name, '', true)
 	__name = __name.substr(0, min(__name.length(), 20))
 	if "" == __name:
 		printerr("Participant name is empty!")
diff --git a/tests/regex.test.gd b/tests/regex.test.gd
new file mode 100644
index 0000000..81f03b1
--- /dev/null
+++ b/tests/regex.test.gd
@@ -0,0 +1,24 @@
+extends WAT.Test
+
+
+func test_regex():
+	var regex = RegEx.new()
+	# nope, no unicode
+#	regex.compile("[^a-zA-Z0-9+._-]+")
+	# compile: 12: unknown property name after \P or \p
+#	regex.compile("[^\\p{Letter}]")  # T_T
+	# This works \o/
+	regex.compile("[^\\p{L}\\p{N}]")
+	
+	var ea = [
+		["zozo04", "zozo04"],
+		["a b c d é", "abcdé"],
+		["仕方がない!", "仕方がない"],
+	]
+	
+	for in_out in ea:
+		var actual = regex.sub(in_out[0], '', true)
+		asserts.is_equal(
+			in_out[1], actual
+		)
+