This pattern should match the datetime, ISBN-like, tokens, and emails provided in the valid section. It uses specific patterns for each type of data. For datetime, it matches the ISO 8601 format and the custom formats provided. For ISBN-like, it matches the specific format with 5 groups of alphanumeric characters separated by hyphens. For tokens, it matches the base64 encoded strings. For emails, it matches the standard email format with optional tags before the @ symbol.