What does a dot mean in regex?

Related questions

1. What is a dot in regex?
2. What do curly braces mean in regex?
3. What is question mark in regex?
4. What does brackets mean in regex?
5. What is regex word boundary?
6. What is PCRE library?
7. What does regex match return?
8. What are regular expressions used for?
9. What is capture group in regex?
10. What does Star mean in regex?

Tags

1. #almost
2. #without
3. #metacharacters
4. #break
5. #unfortunately
6. #expressions
7. #caring
8. #commonly
9. #characters
10. #single
11. #regular
12. #period
13. #exception
14. #character
15. #matches
16. #metacharacter
17. #misused