// include the latest version of the regex crate in your Cargo.toml
extern crate regex;
use regex::Regex;
fn main() {
let regex = Regex::new(r"(?m)(^|[^a-z])\((\d*|[a-z])\)").unwrap();
let string = "(x+2)/(x) -> only select ( ) in (x)
-(2)+. -> only select ( ) in (2)
(wsd). -> select nothing
(x)^2+2 -> only select ( ) in (x)
sin(x). -> select nothing
(22313)a. -> only select ( ) in (22313)
+23-3()/(3x)+(x). -> only select () in () and ( ) in (x)
sin(x)+3*x^2+(x)+23 -> only select ( ) in (x)";
let substitution = "$1$2";
// result will be a String with the substituted value
let result = regex.replace_all(string, substitution);
println!("{}", result);
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Rust, please visit: https://docs.rs/regex/latest/regex/