// 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"(?m)^rgba?\((?:\s+)?(?<r>\d+(?<unit>%?))(?:\s+)?(?<separator>[\s|,])(?:\s+)?(?<g>\d+\k<unit>)(?:\s+)?\k<separator>(?:\s+)?(?<b>\d+\k<unit>)(?:\s+)?(?:(?<=(?:,.+))(?:,(?:\s+)?(?<a>(?:\d+)?(?:\.?\d+)))?(?:\s+)?)?\)$").unwrap();
let string = "// Valid
rgb(120 , 42 , 55)
rgb(23%, 100%, 0%)
rgb(120 42 55)
rgb(23% 100% 0%)
rgb(0 0 0)
rgba(23, 53, 0)
// Invalid
rgb(255, 120 0)
rgb(100% 32 75)
// When an alpha channel is defined, separator must be comma (not sure why but you can try it in browser to see for yourself)
// Valid
rgb(255, 255, 255, 1)
rgb(255, 255, 255, .643)
rgb(255, 255, 255, 1.324 )
rgba(255, 255, 255, 1)
rgba(255, 255, 255, .643)
rgba(255, 255, 255, 1.324 )
// Invalid
rgb(255, 255, 255, )
rgb(255, 255, 255, .)
rgba(255 255 255 1)
rgba(255 255 255, 1)";
// 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/