Here is the list of expressions:

1. . = Matches Any Character

2. \d = Digit (0–9)

3. \D = Not a digit (0–9)

4. \w = Word Character (a-z, A-Z, 0–9, _)

5. \W = Not a word character

6. \s = White space (space, tab, newline)

7. \S = Not white space (space, tab, newline)

8. \b = Word Boundary

9. \B = Not a word boundary

10. ^ = Beginning of a string

11. $ = End of a String

12. [] = matches characters or brackets

13. [^ ] = matches characters Not in brackets

14. | = Either Or

15. ( ) = Group

16. *= 0 or more

17. + = 1 or more

18. ? = Yes or No

19. {x} = Exact Number

20. {x, y} = Range of Numbers (Maximum, Minimum)

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