For a detailed documentation and explanations of regex building blocks and concepts, Regex.ai is a great resource. It's a powerful tool for constructing and editing regular expressions so you can quickly match, find and manipulate text. The AI system constructs and debugs regular expressions automatically, producing accurate and efficient regex patterns for specific data extraction jobs. It also comes with a wealth of documentation to help you learn about regex building blocks, so it's a good resource for programmers, data analysts and researchers.
Another useful tool is ManyExcel, which not only constructs formulas and scripts but also regex patterns with explanations. The AI tool is designed to help you work more efficiently by creating complicated formulas, regex patterns and VBA scripts for Excel and Apps Scripts for Google Workspace. It has a free tier with limited use and a Pro tier for $5/month, so you can use it for personal or professional projects.
Last, rgx.tools is an online AI-powered regex generator and editor. Using GPT-3.5 Turbo, it constructs regex patterns from text prompts and shows examples for common tasks like matching URLs, phone numbers and date formats. The tool is free to use and is good for developers who want to automate the construction and maintenance of regex patterns.