// 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)^(?=.*\$val)(\$val|[-+*\/%|&=<> \d])+$").unwrap();
let string = "For example:
$val > 100 && $val % 2 === 0
$val + 2 === 0
$val - 2 === 0
$val * 2 === 0
$val / 2 === 0
$val | 2 === 0
$val & 2 === 0
$val < 2 === 0
$val > 2 === 0
$val = 2 === 0
should be accepted, but
10 > 100 && 20 === 30
not (due to absense of $val variable)";
// result will be an iterator over tuples containing the start and end indices for each match in the string
let result = regex.captures_iter(string);
for mat in result {
println!("{:?}", mat);
}
}
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/