diff --git a/src/core/config/OperationConfig.js b/src/core/config/OperationConfig.js
index c5b9dd27..a6cf4380 100755
--- a/src/core/config/OperationConfig.js
+++ b/src/core/config/OperationConfig.js
@@ -2304,7 +2304,7 @@ const OperationConfig = {
     },
     "Regular expression": {
         module: "Regex",
-        description: "Define your own regular expression (regex) to search the input data with, optionally choosing from a list of pre-defined patterns.",
+        description: "Define your own regular expression (regex) to search the input data with, optionally choosing from a list of pre-defined patterns.<br><br>Supports extended regex syntax including the 'dot matches all' flag, named capture groups, full unicode coverage (including <code>\\p{}</code> categories and scripts as well as astral codes) and recursive matching.",
         inputType: "string",
         outputType: "html",
         args: [
diff --git a/test/tests/operations/Regex.js b/test/tests/operations/Regex.js
new file mode 100644
index 00000000..dc16910f
--- /dev/null
+++ b/test/tests/operations/Regex.js
@@ -0,0 +1,59 @@
+/**
+ * StrUtils tests.
+ *
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ */
+import TestRegister from "../../TestRegister.js";
+
+TestRegister.addTests([
+    {
+        name: "Regex: non-HTML op",
+        input: "/<>",
+        expectedOutput: "/<>",
+        recipeConfig: [
+            {
+                "op": "Regular expression",
+                "args": ["User defined", "", true, true, false, false, false, false, "Highlight matches"]
+            },
+            {
+                "op": "Remove whitespace",
+                "args": [true, true, true, true, true, false]
+            }
+        ],
+    },
+    {
+        name: "Regex: Dot matches all",
+        input: "Hello\nWorld",
+        expectedOutput: "Hello\nWorld",
+        recipeConfig: [
+            {
+                "op": "Regular expression",
+                "args": ["User defined", ".+", true, true, true, false, false, false, "List matches"]
+            }
+        ],
+    },
+    {
+        name: "Regex: Astral off",
+        input: "𝌆😆",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                "op": "Regular expression",
+                "args": ["User defined", "\\pS", true, true, false, false, false, false, "List matches"]
+            }
+        ],
+    },
+    {
+        name: "Regex: Astral on",
+        input: "𝌆😆",
+        expectedOutput: "𝌆\n😆",
+        recipeConfig: [
+            {
+                "op": "Regular expression",
+                "args": ["User defined", "\\pS", true, true, false, false, true, false, "List matches"]
+            }
+        ],
+    }
+]);