Use the nom crate to build parsers by composing small functions that return results and handle input strings.
Use the nom crate by defining parser functions that return Result<(_, &str), Error> and composing them with combinators like nom::combinator::map.
use nom::{IResult, bytes::complete::tag, combinator::map};
fn parse_hello(input: &str) -> IResult<&str, &str> {
map(tag("hello"), |_| "greeting")(input)
}
fn main() {
let result = parse_hello("hello world");
assert_eq!(result, Ok((" world", "greeting")));
}
Nom is a tool that lets you build complex text parsers by combining small, reusable pieces of logic. Think of it like building with LEGO bricks, where each brick handles a tiny part of the text, and you snap them together to understand the whole sentence. You use it when you need to read structured data like configuration files or network protocols without writing a massive, error-prone parser from scratch.