diff --git a/lib/flagsmith_engine.ex b/lib/flagsmith_engine.ex
index 388103e..c8eac7b 100644
--- a/lib/flagsmith_engine.ex
+++ b/lib/flagsmith_engine.ex
@@ -510,7 +510,7 @@ defmodule Flagsmith.Engine do
         type: :string,
         value: t_value
       }) do
-    case Regex.compile(value) do
+    case Regex.compile(value, [:anchored]) do
       {:ok, regex} ->
         String.match?(t_value, regex)
 
diff --git a/test/unit/segment_conditions_test.exs b/test/unit/segment_conditions_test.exs
index ae49d27..27ef0fc 100644
--- a/test/unit/segment_conditions_test.exs
+++ b/test/unit/segment_conditions_test.exs
@@ -56,6 +56,13 @@ defmodule Flagsmith.Engine.SegmentConditionsTest do
     {:REGEX, "foo", "[a-z]+", true},
     {:REGEX, "FOO", "[a-z]+", false},
     {:REGEX, "1.2.3", "\\d", true},
+    {:REGEX, "production", "prod", true},
+    {:REGEX, "nonproduction", "prod", false},
+    {:REGEX, "development", "prod|dev", true},
+    {:REGEX, "nondevelopment", "prod|dev", false},
+    {:REGEX, "jane@example.com", "@example\\.com$", false},
+    {:REGEX, "jane@example.com", "^[^@]+@example\\.com$", true},
+    {:REGEX, "foo", "[", false},
     {:MODULO, 1, "2|0", false},
     {:MODULO, 2, "2|0", true},
     {:MODULO, 3, "2|0", false},