The provided regex covers all required matches while avoiding additional unwanted matches in the text. Here's the rationale: (1) For dates like '2020-02-29', the regex uses '(\d{4}-\d{2}-\d{2})', handling the year-month-day format of dates; (2) The pattern for European or American style dates (12/31/2019, 15.03.2021) adopts either '(\d{2}/\d{2}/\d{4})' or '(\d{2}\.\d{2}\.\d{4})'. (3) The email pattern ensures valid formats (e.g., username, domains, and extensions). It uses patterns like '[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.\w+' to enforce email structure. (4) The phone patterns '(\(\d{3}\) \d{3}-\d{4})', '(\+?\d+-\d{3}-\d{3}-\d{4})', and '(\d+\.\d+\.\d+( ext\. \d+)?)' ensure valid phone formats. By combining these with alternation ('|'), the regex precisely matches all targets but avoids noise like invalid dates or numbers.