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What is the purpose of using regular expressions (REGEXP) in MySQL?
    Using REGEXP in MySQL

    In MySQL, the **REGEXP** operator allows pattern matching using regular expressions. It is more powerful and flexible than the standard **LIKE** operator, as it can match complex patterns, ranges, repetitions, and character classes.

    Key Uses and Benefits of REGEXP
    • **Pattern Matching:** REGEXP enables matching strings based on complex patterns, such as prefixes, suffixes, or specific character sequences.
    • **Character Classes:** You can match any character from a set, e.g., `[a-z]` matches any lowercase letter.
    • **Quantifiers and Repetition:** REGEXP supports `{n,m}`, `*`, `+`, and `?` to specify repetitions of characters or groups.
    • **Anchors:** Use `^` and `$` to match patterns at the beginning or end of a string.
    • **Alternation:** The `|` operator allows matching one pattern or another, e.g., `'cat|dog'` matches either 'cat' or 'dog'.
    • **Data Validation:** REGEXP is useful for validating formats such as email addresses, phone numbers, or postal codes directly in SQL queries.

    Overall, REGEXP provides a robust way to search, filter, and validate string data using flexible pattern rules that go beyond simple substring matching.

    Example: Using REGEXP to Find Names Starting with 'A' or 'B'
    Example: Using REGEXP for Email Validation