Crate matchable 

matchable provides a convenient enum for checking if a piece of text is matching a string or a regex.

use matchable::Matchable;

assert!(Matchable::Str("Abc".into()).is_match("Abc"));
assert!(!Matchable::Str("Abc".into()).is_match("abc"));
assert!(Matchable::Regex(regex::Regex::new("abc.").unwrap()).is_match("abcd"));

More detail about the usage, please refer to doc of Matchable.

Deserialization

One of the advantages of using this crate is deserialize into a Matchable. This is often used as configuration, and allows user to pass a string or a regex as a pattern.

Here we use JSON as example:

If a string is enclosed with slashes (/), with or without optional flags as suffix, this will be deserialized as a regex:

use matchable::Matchable;

let re_digits = serde_json::from_str::<Matchable>(r#""/\\d+/""#).unwrap();
assert!(re_digits.is_match("123"));

// with regex flags
let re_word = serde_json::from_str::<Matchable>(r#""/matchable/i""#).unwrap();
assert!(re_word.is_match("Matchable"));

Otherwise, it will be parsed as a normal string as-is.

use matchable::Matchable;

let re1 = serde_json::from_str::<Matchable>(r#""/ab""#).unwrap();
assert!(re1.is_match("/ab"));
assert!(!re1.is_match("ab"));

let re2 = serde_json::from_str::<Matchable>(r#""ab/i""#).unwrap();
assert!(re2.is_match("ab/i"));
assert!(!re2.is_match("AB"));

Structs

RegexOnly

This RegexOnly is just a wrapper of Regex. Unlike Matchable, this RegExp treats the whole string as a regular expression, while Matchable only treats it as regular expression when it’s enclosed by /.

Enums

Matchable

Matchable is a wrapper for a plain string or a regex, and it’s used to check matching.