How to write regular expression in java

Commonly used regular expressions: 1. Match any character: .; 2. Match numbers: \d; 3. Match letters: \w; 4. Match white space characters: \s; 5. Match newlines character: \n; 6. Match newline character: \r; 7. Match specific character set: []; 8. Match non-specific character set: [^]; 9. Match the beginning: ^; 10. Match the end: $; 11. Match word boundary: \b; 12. Match zero or more times: *; 13. Match one or more times: ; 14. Match zero or one time: ? and so on.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Regular expressions in Java can be processed through Java's regular expression library. The following are some commonly used regular expressions:

1. Matches any character: .
2. Matches numbers: \d
3. Matches letters: \w
4. Match whitespace characters: \s
5. Match newlines: \n
6. Match newlines: \r
7. Match specific character sets: []
8. Matches a non-specific character set: [^]
9. Matches the beginning: ^
10. Matches the end: $
11. Matches a word boundary: \b
12. Matches zero or Multiple times: *
13. Matches one or more times:
14. Matches zero or one time: ?
15. Matches the previous subexpression one or more times: {n,}
16. Matches the preceding subexpression zero or one time: {n,?}
17. Matches the preceding subexpression exactly n times: {n}
18. Match pattern occurs Any number of times (including zero): *?
19. Matches the pattern exactly n times: {n}?
20. Matches any character except newlines: [\S\s]
21. Matches any character that is not a newline: [^\n]
22. Matches any character except the specified character set: [^...]
23. Matches the beginning of the string :\A
24. End of matching string:\z
25. Start position of matching word:\y
26. End position of matching word:\Y
27. Not Greedy mode: *? ? ?? {n,}? {n,}?? \A\z\y\Y
28. Non-capturing group: (?:...)
29. Capturing group: (...)?
30. Backreference: (...)\k<...>
31. Non-capturing group and backreference combined: (?: ...)\k<...>
32. Ignore case pattern: (?i)

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