Adding apostrophe/single quote to my RegEx match

I'm usi开发者_StackOverflow社区ng [A-Za-z0-9_-] to match letters, numbers and _ and - in my regular expression. I'd like to add the ' character to it but most of my attempts result in server error 500.

Here's the full line from my htaccess:

RewriteRule ^[A-Za-z0-9_-]+/?$ /index.php

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Have you tried escaping it with \?