// 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#"(?xs) ^(?P<timestamp>\d{4}/\d{2}/\d{2}\ \d{2}:\d{2}:\d{2})
\ \[(?P<severity>emerg|alert|crit|error|warn|notice|info)\]
\ (?P<process_id>\d+)
\#(?P<thread_id>\d+):
\ \*(?P<connection_id>\d+)
\ (?P<error>.+?)
(?:\ while\ (?P<context>.+?))?
,\ client:\ (?P<client_ip>\d+\.\d+\.\d+\.\d+)
,\ server:\ (?P<server>.+?)
(?:,\ request:\ \"(?P<request_method>[A-Z]+?)
\ (?P<request_path>\/.+?)
\ (?P<request_protocol>.+?)\")?
(?:,\ upstream:\ \"(?P<upstream>.+?)\")?
(?:,\ host:\ \"(?P<host>.+?)\")?
(?:,\ referrer:\ \"(?P<referrer>.+?)\")?
$"#).unwrap();
let string = "2019/07/11 07:19:30 [error] 934#934: *18897816 open() \"/local/nginx/static/ads.txt\" failed (2: No such file or directory), client: 85.195.82.90, server: app.digitale-sammlungen.de, request: \"GET /ads.txt HTTP/1.1\", host: \"app.digitale-sammlungen.de\"";
// result will be a tuple containing the start and end indices for the first match in the string
let result = regex.captures(string);
let (start, end) = match result {
Some((s, e)) => (s, e),
None => {
// ...
}
};
println!("{}", &string[start, end]);
}
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/