use re.search to filter tests in --run

re.match only find matches where the pattern appears at the beginning of
the string, whereas re.search matches if the pattern appears anywhere in
the string. This is behavior is consistent with pytest, go test and ERP5's
runUnitTest

nxdtest/__init__.py

@@ -355,7 +355,7 @@ class LocalTestResult:
             self.next += 1
 
             # --run
-            if self.run is not None and not re.match(self.run, t.name):
+            if self.run is not None and not re.search(self.run, t.name):
                 continue
 
             test_result_line = LocalTestResultLine()

nxdtest/nxdtest_test.py

@@ -93,7 +93,20 @@ TestCase('TEST2', ['echo', 'TEST2'])
 """,
         argv=["nxdtest", "--run", "TEST1"],
     )
+    captured = capsys.readouterr()
+    assert "TEST1" in captured.out
+    assert "TEST2" not in captured.out
 
+    # --run uses search
+    run_nxdtest(
+        """\
+TestCase('TEST1', ['echo', 'TEST1'])
+TestCase('TEST2', ['echo', 'TEST2'])
+TestCase('TEST10', ['echo', 'TEST10'])
+""",
+        argv=["nxdtest", "--run", "ST1"],
+    )
     captured = capsys.readouterr()
     assert "TEST1" in captured.out
+    assert "TEST10" in captured.out
     assert "TEST2" not in captured.out