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$\begingroup$ If you're not sure you're correct, try proving that you are. Alternatively, you can construct a DFA for the language along the lines of my comment to the post, take the symmetric different with a DFA generated from you regular expression, and verify that the resulting DFA accepts no string. $\endgroup$

Yuval Filmus
– Yuval Filmus

2017-09-24 07:12:08 +00:00
Commented Sep 24, 2017 at 7:12

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Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>
MathJax equations $\sin^2 \theta$

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