Strings & Text

Why String and &str exist as separate types, the UTF-8 invariant Rust enforces on every str, and why byte-indexing a string is a trap.

Learn Rust string fundamentals with 7 examples. Understand String vs &str, ownership, heap allocation, UTF-8, and conversions.

Learn why Rust's byte-based string indexing can panic and discover safe methods for slicing UTF-8 strings, handling characters, and avoiding common pitfalls.

Learn to build and transform Rust strings using push, push_str, format!, and capacity control. Avoid common pitfalls like reallocations.

Parse strings to types using str::parse and FromStr, and convert types to strings with to_string or format!. Learn error handling and common gotchas.

Format strings in Rust using format!, write!, and std::fmt traits. Control precision, width, alignment, and implement custom Display.

Learn to iterate Rust str as Unicode scalars, raw bytes, or grapheme clusters. Understand chars().count() vs len() bytes and UTF-8 validation.

Learn to use Rust's regex crate for efficient pattern matching. Discover how to compile, reuse, and optimize regular expressions for various tasks.

Learn Rust string best practices for efficient, correct, and allocation-aware text handling. Optimize API types, UTF-8 correctness, and performance.

A single-page roundup of every highlight bullet from the 10 pages in the Strings & Text section, grouped by source page so you can scan all 55 takeaways without opening each article individually.