Replace usage of `grep -P` with `perl` in `run_standalone_tests.sh` (#19942)

.azure/gpu-tests-pytorch.yml

@@ -31,6 +31,7 @@ pr:
       - "src/lightning/pytorch/**"
       - "src/pytorch_lightning/*"
       - "tests/tests_pytorch/**"
+      - "tests/run_standalone_*.sh"
       - "pyproject.toml" # includes pytest config
       - "requirements/fabric/**"
       - "src/lightning/fabric/**"

.github/checkgroup.yml

@@ -60,6 +60,7 @@ subprojects:
       - "src/lightning/pytorch/**"
       - "src/pytorch_lightning/*"
       - "tests/tests_pytorch/**"
+      - "tests/run_standalone_*.sh"
       - "pyproject.toml" # includes pytest config
       - "requirements/fabric/**"
       - "src/lightning/fabric/**"
@@ -201,7 +202,6 @@ subprojects:
       - ".azure/gpu-tests-fabric.yml"
       - "examples/fabric/**"
       - "examples/run_fabric_examples.sh"
-      - "tests/run_standalone_*.sh"
       - "requirements/fabric/**"
       - "src/lightning/__init__.py"
       - "src/lightning/__setup__.py"
@@ -209,6 +209,7 @@ subprojects:
       - "src/lightning/fabric/**"
       - "src/lightning_fabric/*"
       - "tests/tests_fabric/**"
+      - "tests/run_standalone_*.sh"
       - "pyproject.toml" # includes pytest config
       - "!requirements/*/docs.txt"
       - "!*.md"

tests/run_standalone_tests.sh

@@ -26,18 +26,17 @@ export PL_RUN_STANDALONE_TESTS=1
 defaults=" -m coverage run --source ${source} --append -m pytest --no-header -v -s --timeout 120 "
 echo "Using defaults: ${defaults}"
 
-# get the testing location as the fist argument
+# get the testing location as the first argument
 test_path=$1
 printf "source path: $test_path\n"
 
 # collect all tests with parametrization based filtering with PL_RUN_STANDALONE_TESTS
 standalone_tests=$(python3 -m pytest $test_path -q --collect-only --pythonwarnings ignore)
-printf "Collected tests: \n $standalone_tests"
+printf "Collected tests: \n $standalone_tests\n"
 # match only lines with tests
-parametrizations=$(grep -oP '\S+::test_\S+' <<< "$standalone_tests")
+parametrizations=$(perl -nle 'print $& while m{\S+::test_\S+}g' <<< "$standalone_tests")
 # convert the list to be array
 parametrizations_arr=($parametrizations)
-
 report=''
 
 rm -f standalone_test_output.txt  # in case it exists, remove it
@@ -47,7 +46,7 @@ function show_batched_output {
   if [ -f standalone_test_output.txt ]; then  # if exists
     cat standalone_test_output.txt
     # heuristic: stop if there's mentions of errors. this can prevent false negatives when only some of the ranks fail
-    if grep -iE 'error|exception|traceback|failed' standalone_test_output.txt | grep -vE 'on_exception|xfailed' | grep -qv -f testnames.txt; then
+    if perl -nle 'print if /error|(?<!(?-i)on_)exception|traceback|(?<!(?-i)x)failed/i' standalone_test_output.txt | grep -qv -f testnames.txt; then
       echo "Potential error! Stopping."
       rm standalone_test_output.txt
       exit 1