// 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)([ :]) # look for : and space as possible leading characters
([\"]?) # if there's a quote, disregard it
([0-9]{4}) # find the year
- # find the 1st dash
( # Group (4)
(
((0[13578] | (10|12)) # look for 31 day months
- # followed by the 2nd dash
(0[1-9]|[1-2][0-9]|3[0-1]) # and accept days up to 31
)
| # OR...
(02 # look for Feb
- # followed by the 2nd dash
(0[1-9]|[1-2][0-9])) # and accept up to 29 days
| # OR...
((0[469]|11)) # look for 30 day months
- # followed by the 2nd dash
((0[1-9]|[1-2][0-9]|30)) # and accept up to 30 days
)
) # closes (4)
([\"]?)([ \"]?)(\s)"#).unwrap();
let string = "This regex changes YYYY-MM-DD to \"[[YYYY-MM-DD]]\" for Obsidian
WORKS ON:
today: 2025-03-14
birthdays: 1966-06-19
Good Dates: 2022-12-31 and 2025-02-08
old-dates: 1492-01-01 old dates could be an issue, depends on how you use your vault!
no space after colon is ok:2023-07-08
standing alone and quoted is fine: \"2021-02-28\"
IGNORES:
my template version number has dots for separators (skip): 2025.12.02
No leading whitespace is questionable?2023-06-08
existing links (no leading : or space):
- [[2025-01-01]]
- [2025-01-01](https:123.com)
- \"[[2023-11-30]]\"
- [[\"2024-06-05\"]]
Not YYYY-MM-DD dates:- 2022-1-1 Euro date: 2022-31-12 or slashes: 2021/09/15
Bad date for month: 2022-02-30 2022-04-31 2022-06-31 2022-11-31 2022-03-32
Don't match serial numbers: 2015-12-3135-89
";
let substitution = "$1\"[[$3-$4]]\"$18";
// result will be a String with the substituted value
let result = regex.replace_all(string, substitution);
println!("{}", result);
}
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/