do something with regex

[Terkwood]

we need to be able to handle multiple regex hits in a file, each individually

create a proper data structure for this app

each file may have multiple matches of multiple searches

• we want grouped by path so that when a file is edited, we can re-match all regex against it
• use std::path::Path
• integration test with file
• learn https://docs.rs/regex/latest/regex/struct.Regex.html#method.replace

matches expose start and end offsets

https://docs.rs/regex/latest/regex/struct.Match.html#method.start

this will help us form a file preview

multi matches

https://stackoverflow.com/a/58010784/9935916

use lazy_static::lazy_static;
use regex::Regex;

fn str_strip_numbers(s: &str) -> Vec<i64> {
    lazy_static! {
        static ref RE: Regex = Regex::new(r"\d+").unwrap();
    }
    // iterate over all matches
    RE.find_iter(s)
        // try to parse the string matches as i64 (inferred from fn type signature)
        // and filter out the matches that can't be parsed (e.g. if there are too many digits to store in an i64).
        .filter_map(|digits| digits.as_str().parse().ok())
        // collect the results in to a Vec<i64> (inferred from fn type signature)
        .collect()
}

capture group offset

https://stackoverflow.com/a/64698180/9935916