// 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)^@ heading2$[\s\S]*?^(?:field2: \"?((?<=\")[^"\\]*(?:\\.[^"\\]*)*(?=\"$)|(?<!\").*(?!\")$)\"?$|)?$[\s\S]*?(?=@ [^\s]*?|\Z)"#).unwrap();
let string = "@ heading1
field1: \"single-line strings are quoted only sometimes.\"
field2: \"strings that span
multiple lines
are always quoted.\"
field3: this single-line string is unquoted.
@ heading2
field1: field names can be repeated among headings.
field2: \"Regex is harder when I add an
@ in a multi-line string, or if I add
backslash-escaped characters like \\\" and \\'.
What happens if I have an empty line in a string?
Also,
[this line]
isn't actually a section.\"
field3: this field comes after field2
[sectionname]
field1: the same field name under a different section.
[anothersection]
field1: a second section under the same heading
field4: field number four
@ heading3
field1: value value value value value
field2: \"quoted string
quoted string
quoted string\"
unique: unique field name";
// 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/