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Regex
1. What is the purpose of using regular expressions (REGEXP) in MySQL?
Level: Expert | Frequency: High
2. What is the difference between the LIKE operator and the REGEXP operator?
Level: Expert | Frequency: High
3. How do you use the REGEXP operator in a SELECT query?
Level: Expert | Frequency: High
4. What does the caret (^) symbol mean in a MySQL regular expression?
Level: Expert | Frequency: High
5. What does the dollar sign ($) mean in a MySQL REGEXP pattern?
Level: Expert | Frequency: High
6. What does the dot (.) symbol match in a MySQL regular expression?
Level: Expert | Frequency: High
7. How can you use REGEXP to find values starting with a particular letter (e.g., names starting with ‘A’)?
Level: Expert | Frequency: High
8. What is the difference between REGEXP and RLIKE in MySQL?
Level: Expert | Frequency: High
9. How can you perform a case-insensitive REGEXP search in MySQL?
Level: Expert | Frequency: High
10. How do you check if a column value contains only numeric characters using REGEXP?
Level: Expert | Frequency: High
11. How can you use square brackets [ ] in REGEXP patterns to match a range of characters?
Level: Expert | Frequency: High
12. What is the use of the pipe (|) symbol in MySQL REGEXP patterns?
Level: Expert | Frequency: High
13. How do quantifiers like *, +, and ? work in MySQL regular expressions?
Level: Expert | Frequency: High
14. How can you find strings containing specific words using REGEXP (for example, “cat” or “dog”)?
Level: Expert | Frequency: High
15. How do you use {m,n} quantifiers in MySQL REGEXP to match a specific number of occurrences?
Level: Expert | Frequency: High
16. Explain how you can use character classes such as [0-9], [A-Za-z], or [:digit:] in MySQL REGEXP.
Level: Expert | Frequency: High
17. What is the difference between [A-Z] and [[:upper:]] in MySQL REGEXP?
Level: Expert | Frequency: High
18. How can you extract records where a string contains multiple words separated by spaces using REGEXP?
Level: Expert | Frequency: High
19. What happens when you use REGEXP on columns that contain NULL values?
Level: Expert | Frequency: High
20. Can you use REGEXP with the NOT operator? Give an example.
Level: Expert | Frequency: High
21. How does MySQL handle regular expressions internally (regex engine type and case sensitivity)?
Level: Expert | Frequency: High
22. What’s the difference between REGEXP in MySQL 5.x and REGEXP in MySQL 8.0 (which uses ICU-based regex)?
Level: Expert | Frequency: High
23. How can you use the REGEXP_REPLACE() function introduced in MySQL 8.0?
Level: Expert | Frequency: High
24. Explain how REGEXP_INSTR() differs from LOCATE() and INSTR() functions.
Level: Expert | Frequency: High
25. How can you validate email addresses or phone numbers using REGEXP in MySQL?
Level: Expert | Frequency: High
26. What are the performance implications of using REGEXP on large text columns, and how can you optimize it?
Level: Expert | Frequency: High
27. How can you use REGEXP in conjunction with other clauses like WHERE, GROUP BY, or CASE?
Level: Expert | Frequency: High
28. Can you combine multiple REGEXP conditions using logical operators (AND/OR)? Show an example.
Level: Expert | Frequency: High
29. How does MySQL REGEXP handle Unicode characters and multibyte character sets like UTF-8?
Level: Expert | Frequency: High
30. When should you prefer REGEXP over full-text search or LIKE, and when should you avoid it?
Level: Expert | Frequency: High
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