// 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"(?mx)(# the number at the beginning
[-+]? # optional leading sign
\d+# the digits to the left of the decimal
(?:\.\d+)? # an optional decimal amount
)
(#units
\/? #optional slash
[a-zA-Z]+ # must be alphabetic
(\^?[-+]?\d+(?:\.\d+)?)? # a caret followed by our same/initial digit pattern
)+").unwrap();
let string = "Very much a stupid beginner question, but trying to make a regex expression which would take in \"5ms-1\", \"17km/h\" or \"9ms^-2\" etc. with these ambiguous units and ambiguous formats. Please help, I can't manage it
5ms-1
17km/h
9ms^-2
-5mph
6.8m/h
+8liters/hectacre^2
5/h
1m^2s^2
this will also match the 21st century, 7eleven, 3M, and similar things.
";
// 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/