// 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#"(?xi)# you define first the basic elements (as for a lexer) with named groups
(?(DEFINE)
(?<var> [a-z_]\w*)
(?<dqstr> (?<=") [^\\"]*+ (?s:\\.[^\\"]*)*+ (?=") )
(?<sqstr> (?<=') [^\\']*+ (?s:\\.[^\\']*)*+ (?=') )
(?<string> \g<dqstr> | \g<sqstr> )
(?<num> [0-9]+(?:\.[0-9]+)? )
(?<value> \g<string> | \g<num> )
(?<comp> [!><=]= | =?[><])
)
# Then you write the pattern using these named groups
(?J) # allow duplicate named groups
# variable op value
(?<key> \g<var> ) \h* \g<comp> \h* ["']?(?<val> \g<value>) ["']?
| # OR
# value op variable
["']?(?<val> \g<value>) ["']? \h* \g<comp> \h* (?<key> \g<var> )
"#).unwrap();
let string = "type == 'prova' && padposition == \"stefano\" or 10>var_name";
// 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/