diff --git a/README.md b/README.md
index 7d4ae58..9eef437 100644
--- a/README.md
+++ b/README.md
@@ -448,7 +448,7 @@ Example synchronous message:
             "matchers": [
               {
                 "match": "regex",
-                "regex": "CONTENT_MATCHER|CONTENT_GENERATOR"
+                "regex": "^(CONTENT_MATCHER|CONTENT_GENERATOR)$"
               }
             ]
           }
diff --git a/testcases/message/body/matches with regex.json b/testcases/message/body/matches with regex.json
index 23a611d..a40cf05 100644
--- a/testcases/message/body/matches with regex.json	
+++ b/testcases/message/body/matches with regex.json	
@@ -30,7 +30,7 @@
           "matchers": [
             {
               "match": "regex",
-              "regex": "red|blue"
+              "regex": "^(red|blue)$"
             }
           ]
         },
@@ -38,7 +38,7 @@
           "matchers": [
             {
               "match": "regex",
-              "regex": "red|blue"
+              "regex": "^(red|blue)$"
             }
           ]
         }
diff --git a/testcases/request/body/matches with regex xml.json b/testcases/request/body/matches with regex xml.json
index c7fa8c2..458a931 100644
--- a/testcases/request/body/matches with regex xml.json	
+++ b/testcases/request/body/matches with regex xml.json	
@@ -20,7 +20,7 @@
           "matchers": [
             {
               "match": "regex",
-              "regex": "red|blue"
+              "regex": "^(red|blue)$"
             }
           ]
         }
diff --git a/testcases/request/body/matches with regex.json b/testcases/request/body/matches with regex.json
index e9f0ded..3f7ce80 100644
--- a/testcases/request/body/matches with regex.json	
+++ b/testcases/request/body/matches with regex.json	
@@ -20,7 +20,7 @@
           "matchers": [
             {
               "match": "regex",
-              "regex": "red|blue"
+              "regex": "^(red|blue)$"
             }
           ]
         },
@@ -28,7 +28,7 @@
           "matchers": [
             {
               "match": "regex",
-              "regex": "red|blue"
+              "regex": "^(red|blue)$"
             }
           ]
         }