Combined emphasis:
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
- test test
Incorrect nesting:
- *test  test*  test
- _test  test_  test
- **test  test* test*
- __test  test_ test_
- test   *test  test*
- test   _test  test_
- test test test
- test test test
No emphasis:
- test*  test  *test
- test** test **test
- test_  test  _test
- test__ test __test
Middle-word emphasis (asterisks):
- ab
- ab
- abc
- ab
- ab
- abc
Middle-word emphasis (underscore):
- ab
- ab
- abc
- ab
- ab
- abc
mypreciousfile.txt
Tricky Cases
E**. Test TestTestTest
E**. Test Test Test Test