How do quantifiers like *, +, and ? work in MySQL regular expressions?

Using Quantifiers *, +, and ? in MySQL REGEXP Patterns

In MySQL regular expressions, quantifiers control how many times the preceding element in a pattern can occur. They allow flexible matching of repeated characters or sub-patterns.

Key Quantifiers in MySQL REGEXP

Asterisk *: Matches zero or more occurrences of the preceding character or group. For example, 'a*' matches '', 'a', 'aa', 'aaa', etc.
Plus +: Matches one or more occurrences of the preceding character or group. For example, 'a+' matches 'a', 'aa', 'aaa', etc., but not ''.
Question Mark ?: Matches zero or one occurrence of the preceding character or group. For example, 'a?' matches '' or 'a'.
Combining with Other Patterns: Quantifiers can be applied to character classes or grouped sub-patterns, e.g., '[0-9]+' matches one or more digits.

Using quantifiers allows you to write more flexible and concise patterns, especially when the number of repeated characters or elements in a string can vary.

Example: Match Zero or More 'a's

Example: Match One or More Digits

Example: Optional Character 's'

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