twister: support filtering tests using regex

Use --test-pattern to filter scenarios using regular expressions, for
example:

./scripts/twister --test-pattern '^kernel.semaphore.*' -v

will run all those test using this identifier pattern, and nothing else.
Multiple patterns are possible.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

scripts/pylib/twister/twisterlib/environment.py

@@ -253,6 +253,12 @@ def add_parse_arguments(parser = None) -> argparse.ArgumentParser:
         timeout would be multiplication of test timeout value, board-level timeout multiplier
         and global timeout multiplier (this parameter)""")
 
+    test_xor_subtest.add_argument(
+        "--test-pattern", action="append",
+        help="""Run only the tests matching the specified pattern. The pattern
+        can include regular expressions.
+        """)
+
     test_xor_subtest.add_argument(
         "-s", "--test", "--scenario", action="append", type = norm_path,
         help="""Run only the specified test suite scenario. These are named by

scripts/pylib/twister/twisterlib/testplan.py

@@ -190,6 +190,7 @@ def discover(self):
 
         self.add_configurations()
         num = self.add_testsuites(testsuite_filter=self.run_individual_testsuite)
+
         if num == 0:
             raise TwisterRuntimeError("No testsuites found at the specified location...")
         if self.load_errors:
@@ -202,6 +203,20 @@ def discover(self):
         for _, ts in self.testsuites.items():
             self.scenarios.append(ts.id)
 
+        if self.options.test_pattern:
+            logger.info(
+                "Running tests matching the specified patterns: %s",
+                ', '.join(self.options.test_pattern)
+            )
+            # If test_pattern is used, we run all tests that match the pattern.
+            # The pattern can be a regular expression.
+            self.run_individual_testsuite = []
+            for pattern in self.options.test_pattern:
+                r = re.compile(pattern)
+                for ts in self.testsuites.values():
+                    if r.search(ts.id):
+                        self.run_individual_testsuite.append(ts.id)
+
         self.report_duplicates()
         self.parse_configuration(config_file=self.env.test_config)