How to iterate through characters in a string in Rust?

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Just starting to play around with Rust. Starting with a basic example, iterating through a sentence to extract out simple words from the string.

Here's what I have so far, trying to make that parse function first match world in the input string:

fn parse(input: ~str) -> ~str {
  let mut val = ~"";

  for c in input.chars() {
    if c == ~"w" { // guessing I have to test one character at a time
      val.push_str(c.to_str()); 
    }
  }

  return val;
}

fn main() {
  let s: ~str = ~"Hello world!";
  println!("{}", parse(s));
}

What is the correct way to iterate through the characters in a string to match patterns in Rust (such as for a basic parser)? Are there any open source repos that show a real-world example to do this too, that would be helpful as well.

asked 46 secs ago

Lance Pollard

16.3k