Summary

Regular expressions are an indispensable tool for pattern matching and manipulation in text. With their concise syntax and powerful capabilities, they enable a wide range of tasks, from simple string searches to complex data extraction. In this chapter, we explored the core concepts of regular expressions, including their building blocks.

We examined Swift's support for regular expressions, starting with the use of regular expression literals and the Regex type. Both methods allow for pattern matching and manipulation directly within Swift code. Next, we introduced Regex Builder which provides a more readable and maintainable way to define regular expressions using a declarative syntax. Finally, at the end of the chapter, we looked at advanced features of Regex Builder, including transforming and capturing matches using references.

Now let's look at how we can create subscripts for our custom types.