diff --git a/README.md b/README.md
index 12a9b05..867c5ca 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Log Reader User Manual 3.3.0
+# Log Reader User Manual 3.3.1
 
 ## Document Information
 
@@ -168,6 +168,12 @@ Output: 8=FIXT.1.1\u00019=66\u000135=A\u000134=1\u000149=NFT2_FIX1\u000156=FGW\u
 
 ## Changes
 
+### 3.3.1
+
+#### Fixed
+
++ Bug when we tried to substitute the values from string extracted from the log if it had content like this `${something}`
+
 ### 3.3.0
 
 + Add support for truncated files. `allowFileTruncate` parameter in `common` configuration is added.
diff --git a/gradle.properties b/gradle.properties
index c30aed8..124cca7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1 +1 @@
-release_version=3.3.0
\ No newline at end of file
+release_version=3.3.1
\ No newline at end of file
diff --git a/src/main/java/com/exactpro/th2/readlog/RegexLogParser.java b/src/main/java/com/exactpro/th2/readlog/RegexLogParser.java
index daf6a93..e4ff06d 100644
--- a/src/main/java/com/exactpro/th2/readlog/RegexLogParser.java
+++ b/src/main/java/com/exactpro/th2/readlog/RegexLogParser.java
@@ -181,14 +181,14 @@ private StringSubstitutor createSubstitutor(Matcher matcher) {
             Integer index = tryParse(key);
             if (index == null) {
                 return matcher.group(key);
-            } else {
-                if (index < 0) {
-                    throw new IllegalArgumentException("group index cannot be negative");
-                }
-                return matcher.group(index);
             }
+            if (index < 0) {
+                throw new IllegalArgumentException("group index cannot be negative");
+            }
+            return matcher.group(index);
         });
         stringSubstitutor.setEnableUndefinedVariableException(true); // exception if key is unknown
+        stringSubstitutor.setDisableSubstitutionInValues(true);
         return stringSubstitutor;
     }
 
diff --git a/src/test/java/com/exactpro/th2/readlog/TestRegexLogParserJoining.java b/src/test/java/com/exactpro/th2/readlog/TestRegexLogParserJoining.java
index 808a0eb..ddac41d 100644
--- a/src/test/java/com/exactpro/th2/readlog/TestRegexLogParserJoining.java
+++ b/src/test/java/com/exactpro/th2/readlog/TestRegexLogParserJoining.java
@@ -52,6 +52,30 @@ void joinsIfOneMatchFound() {
                 body.get(0));
     }
 
+    @Test
+    void doesNotTryToSubstituteInResultString() {
+        AliasConfiguration configuration = new AliasConfiguration(
+                "(] )(.*$)",
+                ".*",
+                null,
+                null,
+                null
+        );
+        configuration.setJoinGroups(true);
+        configuration.setHeadersFormat(Map.of(
+                "Header", "Group 2: ${2}"
+        ));
+        RegexLogParser parser = new RegexLogParser(Map.of("test", configuration));
+
+        LogData data = parser.parse(new StreamId("test", Direction.FIRST), "[test] should not try to process ${3} and ${variable}");
+        List<String> body = data.getBody();
+        Assertions.assertEquals(1, body.size(), () -> "Unexpected strings: " + body);
+        Assertions.assertEquals(
+                "\"Header\"\n"
+                        + "\"Group 2: should not try to process ${3} and ${variable}\"",
+                body.get(0));
+    }
+
     @Test
     void joinsIfManyMatchesFound() {
         AliasConfiguration configuration = new AliasConfiguration(