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1. 100% twitter compatible `@mentions` regex! Regular expression for matching `@username` mentions, as used on twitter, facebook, github, etc.

   JavaScript 105 3

2. Best YouTube Video ID regex. Online: https://regex101.com/r/rN1qR5/2 and http://regexr.com/3anm9

   JavaScript 87 8

3. Function regex. Regular expression for matching function parts. Expose match groups for function name, arguments and function body.

   JavaScript 30 4

4. Regular expression for usernames

   JavaScript 47 6

5. Regular expression for getting the root of a posix or windows filepath.

   JavaScript 13 3

6. Generates a regular expression for validating a range of years.

   JavaScript 15 3