// 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)# match a body pattern alone on a line
^\g<body>$
# we'll use (?<name>...){0} to define the pattern \g<name>
# without having to match the pattern at the current position
# a body pattern matches
(?<body>
# a sequence of
(?: [^\[\]{}()\n] # non-delimiters
| \g<parens> # parenthesized pattern
| \g<square_brackets> # bracketed pattern
| \g<curly_braces> # braced pattern
)*
){0}
# a parenthesized pattern matches
(?<parens>
\( # an open paren
\g<body> # a valid body
\) # a close paren
){0}
# a bracketed pattern matches
(?<square_brackets>
\[ # an open square bracket
\g<body> # a valid body
\] # a close square bracket
){0}
# a braced pattern matches
(?<curly_braces>
\{ # an open curly brace
\g<body> # a valid body
\} # a close curly brace
){0}").unwrap();
let string = "matches:
a plain string
a string containing (matched parens) [matched brackets] and {matched braces}
nested (parens (within) parens)
nested [parens (within) brackets]
()()[({({[]})[({})]})]
non-matches:
(unbalanced parens
([balanced but misordered)]";
// 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/