docs.rs failed to build strscan-0.1.0
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extern crate strscan;
use strscan::StringScanner;

let s = StringScanner::new(input_string);
let r_chars = Regex::new(r"\A\s*(\w+)\s*")

let res = s.scan(r_chars)
println!("chars with possible space: {}", res.unwrap());
println!("chars: {}", s.match_at(1).unwrap());