What is backtracking in regex?

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Tags

1. #contains
2. #continue
3. #quantifiers
4. #saved
5. #search
6. #regular
7. #occurs
8. #state
9. #constructs
10. #expression
11. #returns
12. #pattern
13. #engine
14. #previous
15. #alternation
16. #optional
17. #match
18. #backtracking