diff --git a/llvm/utils/lit/tests/test-output-micro.py b/llvm/utils/lit/tests/test-output-micro.py
--- a/llvm/utils/lit/tests/test-output-micro.py
+++ b/llvm/utils/lit/tests/test-output-micro.py
@@ -39,7 +39,7 @@
 # CHECK-NEXT:   },
 # CHECK-NEXT:   {
 # CHECK-NEXT:     "code": "PASS",
-# CHECK-NEXT:     "elapsed": {{[0-9.]+}},
+# CHECK-NEXT:     "elapsed": {{[+-]?([[:digit:]]+(.[[:digit:]]*)?|.[[:digit:]]+)([eE][+-]?[[:digit:]]+)?}},
 # CHECK-NEXT:     "metrics": {
 # CHECK-NEXT:       "value0": 1,
 # CHECK-NEXT:       "value1": 2.3456
diff --git a/llvm/utils/lit/tests/test-output.py b/llvm/utils/lit/tests/test-output.py
--- a/llvm/utils/lit/tests/test-output.py
+++ b/llvm/utils/lit/tests/test-output.py
@@ -7,7 +7,7 @@
 # CHECK-NEXT: "tests": [
 # CHECK-NEXT:   {
 # CHECK-NEXT:     "code": "PASS",
-# CHECK-NEXT:     "elapsed": {{[0-9.]+}},
+# CHECK-NEXT:     "elapsed": {{[+-]?([[:digit:]]+(.[[:digit:]]*)?|.[[:digit:]]+)([eE][+-]?[[:digit:]]+)?}},
 # CHECK-NEXT:     "metrics": {
 # CHECK-NEXT:       "value0": 1,
 # CHECK-NEXT:       "value1": 2.3456