count matches with regex
To count matches with a regular expression in Rust, you can use the regex
crate. Here's an example:
use regex::Regex;
fn main() {
let re = Regex::new(r"pattern").unwrap();
let text =```rust
use regex::Regex;
fn main() {
let re = Regex::new(r"pattern").unwrap();
let text = "example pattern example pattern";
let count = re.find_iter(text).count();
println!("{}", count);
}