9 releases (breaking)
0.7.1 | Sep 5, 2022 |
---|---|
0.7.0 | Aug 31, 2022 |
0.6.0 | Aug 30, 2022 |
0.5.1 | Aug 29, 2022 |
0.1.0 | Aug 27, 2022 |
#16 in #pattern-match
22 downloads per month
44KB
787 lines
vec-reg
Generalized regex like pattern match for vector.
Install
# Cargo.toml
[dependencies]
vec-reg = "0.7.1"
Usage
use vec_reg::{Regex, CompiledRegex, vec_reg};
let is_fizz = |x: &i32| x % 3 == 0;
let is_buzz = |x: &i32| x % 5 == 0;
let reg = vec_reg!(([is_fizz])((?:[is_buzz])(?P<"FizzBuzz">[|x| x % 15 == 0]))+).compile();
assert!(reg.is_match(&[1, 2, 3, 5, 15, 20]));
assert!(reg.is_full_match(&[3, 5, 15, 10, 30]));
let find_result = reg.find(&[1,3,5,15]);
assert!(find_result.is_some());
assert_eq!(find_result.as_ref().unwrap().range(), 1..4);
let captures = reg.captures(&[1, 3, 5, 15, 10, 30, 2]);
assert!(captures.is_some());
// 0th capture always correspond to the entire match.
assert_eq!(captures.as_ref().unwrap().get(0).unwrap().range(), 1..6);
assert_eq!(captures.as_ref().unwrap().get(1).unwrap().range(), 1..2);
assert_eq!(captures.as_ref().unwrap().get(1).unwrap().values(), &[3]);
// Named capture can be accessed both index and name.
assert_eq!(captures.as_ref().unwrap().get(3).unwrap().values(), &[30]);
assert_eq!(captures.as_ref().unwrap().get(3).unwrap().range(), 5..6);
assert_eq!(captures.as_ref().unwrap().name("FizzBuzz").unwrap().values(), &[30]);
assert_eq!(captures.as_ref().unwrap().name("FizzBuzz").unwrap().range(), 5..6);
Supported Syntax
Syntax | Description |
---|---|
[function_name] |
Match any values that satisfied given function. |
[|x| *x == 1] |
Match any values that satisfied given closure. |
[^function_name] |
Match any values that not satisfied given function. |
[^|x| *x == 1] |
Match any values that not satisfied given closure. |
. |
Match any values. |
^ |
a beginning of input |
$ |
a end of input |
(R) |
numbered capturing group (submatch) |
(?:R) |
non-capturing group |
(?P<"name">R) |
named & numbered capturing group (submatch) |
RS |
R followed by S |
R|S |
R or S (prefer R ) |
R? |
zero or one R , prefer one |
R?? |
zero or one R , prefer zero |
R* |
zero or more R , prefer more |
R*? |
zero or more R , prefer fewer |
R+ |
one or more R , prefer more |
R+? |
one or more R , prefer fewer |
R{n,m} |
n or n + 1 or ... or m , prefere more |
R{n,m}? |
n or n + 1 or ... or m , prefere fewer |
R{n,} |
n or more R , prefere more |
R{n,}? |
n or more R , prefere fewer |
R{n} |
exactly n R |
R{n}? |
exactly n R |
Dependencies
~1.2–1.8MB
~44K SLoC