The author discusses the importance of writing high-quality regular expressions, particularly when it comes to boundary markers and complexity. They highlight the risks of using boundaries incorrectly, which can lead to patterns that don't match anything at all. The author also emphasizes the need for maintainability and simplicity in regular expressions, citing examples of complicated regexes used for matching dates and email addresses. To address this issue, SonarQube offers a rule for finding regular expressions with complexity exceeding a configurable threshold, which can help developers identify and simplify their regex patterns. By following best practices such as breaking down complex regexes into smaller parts and using meaningful variable names, developers can write more accurate and maintainable regular expressions.