Question

How to split a string on multiple single‑character delimiters (and keep them) in Rust

Answer 1

use regex::Regex;

fn split_keep_delims(s: &str, delimiters: &str) -> Vec<String> {
    // Build regex: e.g. ",;|" → "([,;|])"
    let pattern = format!("([{}])", regex::escape(delimiters));
    let re = Regex::new(&pattern).unwrap();

    let mut result = Vec::new();
    let mut last_end = 0;

    for m in re.find_iter(s) {
        let start = m.start();
        let end = m.end();

        // Add text before delimiter
        if start > last_end {
            result.push(s[last_end..start].to_string());
        }

        // Add the delimiter itself
        result.push(s[start..end].to_string());

        last_end = end;
    }

    // Add remaining text after last delimiter
    if last_end < s.len() {
        result.push(s[last_end..].to_string());
    }

    result
}

fn main() {
    let input = "aa,bbb;cccc|ddddd";
    let parts = split_keep_delims(input, ",;|");

    for p in parts {
        print!("[{}] ", p);
    }
}




/*
run:

[aa] [,] [bbb] [;] [cccc] [|] [ddddd] 

*/

 

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