fix: handle numbered suffixes in Java instrumented test files

Some instrumented test files have numeric suffixes like _2, _3:
- FibonacciSeriesTest__perfinstrumented_2.java
- KnapsackTest__perfonlyinstrumented_3.java

Updated regex to match optional numeric suffix: (?:_\d+)?
Updated test to verify files with suffixes are detected.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

code_to_optimize/java/codeflash.toml

@@ -3,3 +3,4 @@
 [tool.codeflash]
 module-root = "src/main/java"
 tests-root = "src/test/java"
+formatter-cmds = []

codeflash/optimization/optimizer.py

@@ -639,6 +639,8 @@ class Optimizer:
         Java patterns:
         - '*Test__perfinstrumented.java'
         - '*Test__perfonlyinstrumented.java'
+        - '*Test__perfinstrumented_{n}.java' (with optional numeric suffix)
+        - '*Test__perfonlyinstrumented_{n}.java' (with optional numeric suffix)
 
         Returns a list of matching file paths.
         """
@@ -650,8 +652,8 @@ class Optimizer:
             r"test.*__perf_test_\d?\.py|test_.*__unit_test_\d?\.py|test_.*__perfinstrumented\.py|test_.*__perfonlyinstrumented\.py|"
             # JavaScript/TypeScript patterns (new naming with .test/.spec preserved)
             r".*__perfinstrumented\.(?:test|spec)\.(?:js|ts|jsx|tsx)|.*__perfonlyinstrumented\.(?:test|spec)\.(?:js|ts|jsx|tsx)|"
-            # Java patterns
-            r".*Test__perfinstrumented\.java|.*Test__perfonlyinstrumented\.java"
+            # Java patterns (with optional numeric suffix _2, _3, etc.)
+            r".*Test__perfinstrumented(?:_\d+)?\.java|.*Test__perfonlyinstrumented(?:_\d+)?\.java"
             r")$"
         )
 

tests/test_cleanup_instrumented_files.py

@@ -13,8 +13,13 @@ def test_find_leftover_instrumented_test_files_java(tmp_path):
     # Create Java instrumented test files (should be found)
     java_perf1 = test_root / "FibonacciTest__perfinstrumented.java"
     java_perf2 = test_root / "KnapsackTest__perfonlyinstrumented.java"
+    # Create files with numeric suffixes (also should be found)
+    java_perf3 = test_root / "FibonacciTest__perfinstrumented_2.java"
+    java_perf4 = test_root / "KnapsackTest__perfonlyinstrumented_3.java"
     java_perf1.touch()
     java_perf2.touch()
+    java_perf3.touch()
+    java_perf4.touch()
 
     # Create normal Java test file (should NOT be found)
     normal_test = test_root / "CalculatorTest.java"
@@ -24,15 +29,17 @@ def test_find_leftover_instrumented_test_files_java(tmp_path):
     leftover_files = Optimizer.find_leftover_instrumented_test_files(tmp_path)
     leftover_names = {f.name for f in leftover_files}
 
-    # Assert instrumented files are found
+    # Assert instrumented files are found (including those with numeric suffixes)
     assert "FibonacciTest__perfinstrumented.java" in leftover_names
     assert "KnapsackTest__perfonlyinstrumented.java" in leftover_names
+    assert "FibonacciTest__perfinstrumented_2.java" in leftover_names
+    assert "KnapsackTest__perfonlyinstrumented_3.java" in leftover_names
 
     # Assert normal test file is NOT found
     assert "CalculatorTest.java" not in leftover_names
 
-    # Should find exactly 2 files
-    assert len(leftover_files) == 2
+    # Should find exactly 4 files
+    assert len(leftover_files) == 4
 
 
 def test_find_leftover_instrumented_test_files_python(tmp_path):