diff --git a/scraping_test.go b/scraping_test.go
index 1524d9a..cd5a21c 100644
--- a/scraping_test.go
+++ b/scraping_test.go
@@ -145,6 +145,7 @@ func TestFilterReplace(t *testing.T) {
 		Var2  string
 		Want  string
 	}{
+		// remove tests
 		{"0123456789", "0", "", "123456789"},
 		{"0123456789", "9", "", "012345678"},
 		{"0123456789", "3456", "", "012789"},
@@ -152,9 +153,25 @@ func TestFilterReplace(t *testing.T) {
 		{"世界日本語", "世", "", "界日本語"},
 		{"世界日本語", "語", "", "世界日本"},
 		{"世界日_世界日_世界日", "界", "", "世日_世日_世日"},
-		// TODO add replace tests
-		// TODO add regex tests
-		// TODO add regex replace tests
+
+		// replace tests
+		{"0123456789", "0", "a", "a123456789"},
+		{"0123456789", "9", "b", "012345678b"},
+		{"0123456789", "3456", "abcd", "012abcd789"},
+		{"0123456789_0123456789", "3456", "abcd", "012abcd789_012abcd789"},
+		{"世界日本語", "世", "本語", "本語界日本語"},
+		{"世界日本語", "語", "日", "世界日本日"},
+		{"世界日_世界日_世界日", "界", "語", "世語日_世語日_世語日"},
+
+		// regex tests
+		{"0123456789", "0[0-9]{2}", "", "3456789"},
+		{"0123456789", "[0-9]{2}9", "", "0123456"},
+		{"0123456789", "[0-9]+", "", ""},
+		{"Hello World!", "[eo]", "", "Hll Wrld!"},
+		{"世界日本語", "[界本]", "", "世日語"},
+
+		// regex replace tests
+		{"<span>123.65</span>", "<span>([0-9.]+)</span>", "$1", "123.65"},
 	}
 
 	for _, test := range tests {
diff --git a/todo.md b/todo.md
index a592b7b..47473f4 100644
--- a/todo.md
+++ b/todo.md
@@ -5,6 +5,5 @@
 - trusted proxies in conf?
 - log things to db for cron runs 
 - comments
-- add test for regex replace with group
 - run/fix staticcheck
 - add browserless support ?
\ No newline at end of file