Combined emphasis:

1. test test
2. test test
3. test test
4. test test
5. test test
6. test test
7. test test
8. test test
9. test test
10. test test
11. test test
12. test test
13. test test
14. test test
15. test test
16. test test
17. test test
18. test test
19. test test
20. test test
21. test test
22. test test
23. test test
24. test test
25. test test
26. test test
27. test test
28. test test
29. test test
30. test test

Incorrect nesting:

1. *test test* test
2. _test test_ test
3. test *test test*
4. test _test test_
5. test *test test*
6. test _test test_
7. test **test test**
8. test __test test__
9. _some text_
10. *some text*
11. _some text_
12. *some text*

No emphasis:

1. test* test *test
2. test** test **test
3. test_ test _test
4. test__ test __test

Middle-word emphasis (asterisks):

1. ab
2. ab
3. abc
4. ab
5. ab
6. abc

Middle-word emphasis (underscore):

1. _a_b
2. a_b_
3. a_b_c
4. __a__b
5. a__b__
6. a__b__c

my_precious_file.txt

Tricky Cases

E**. Test TestTestTest

E**. Test Test Test Test

Overlong emphasis

Name: ____________
Organization: ____
Region/Country: __

_____Cut here_____

____Cut here____

Regression

Note: This is emphasis.