recursively read files in a directory [Rust]

find_files_by_extension.rs

use std::fs;
use std::path::Path;

extern crate regex;
use regex::Regex;

fn main() {
  get_files(local_index_file_path, vec!["^*.caidx$".to_owned(), "^*.caibx$".to_owned()]);
  get_files(local_chunks_file_path, vec!["^*.cacnk$".to_owned()]);
}

// Print file names with specific extension, recursively
fn get_files(path: String, formats: Vec<String>) {
  let mut files: Vec<String> = Vec::new();
    let mut rexps: Vec<Regex> = Vec::new();

  for format in formats {
        rexps.push(Regex::new(&format).unwrap());
  }
  read_dir_recursive(path.to_owned(), &mut files, rexps.clone());
  for name in files.iter() {
      println!("File-> {}", name);
  }
}

// Read file names of specific extension, recursively in all dirs
fn read_dir_recursive(path: String, files: &mut Vec<String>, rexps: Vec<Regex>) {
    if Path::new(&path).is_dir() {
        for entry in fs::read_dir(&path).unwrap() {
            let dir = entry.unwrap();
            read_dir_recursive(dir.path().into_os_string().into_string().unwrap().to_owned(), files, rexps.clone());
        }
    } else {
        for rexp in rexps.iter() {
            if rexp.is_match(&path) {
                println!("file-> {}", path);
                files.push(path.to_owned());
            }
        }
    }
}