regex_quote_fixer

Regex Quote Fixer 重写 grep 正则表达式以在 regex 包中使用。

此包允许通过决定何时在正则表达式字符串中添加或删除元字符 '\\' 来在不同的正则表达式实现之间进行转换。

示例

use regex_quote_fixer::RegexQuoteFixer;
let rqf = RegexQuoteFixer::for_grep();

// as used with grep
let needle = r#"https\?://\([[:alnum:].]*\.\)\?example\.com/"#;

let needle_fixed = rqf.fix( needle);

assert_eq!( needle_fixed, r#"https?://([[:alnum:].]*\.)?example\.com/"#);

use regex::Regex;

let regex = Regex::new( &needle_fixed).unwrap();

assert!( regex.is_match( r#"https://www.example.com/"#));
assert!( regex.is_match( r#"http://www.example.com/"#));
assert!( regex.is_match( r#"http://example.com/"#));

// and it is also possible to convert regex compatible regexpressions
// to grep regexpressions :

let needle2 = rqf.fix( &needle_fixed);

assert_eq!( needle, needle2);

另一个示例

use regex_quote_fixer::RegexQuoteFixer;
let rqf = RegexQuoteFixer::for_grep();

// as used with grep
let needle = r#"^a\+[]\?]b\+$"#;

let needle_fixed = rqf.fix( needle);

assert_eq!( needle_fixed, r#"^a+[]\\?]b+$"#);

use regex::Regex;

let regex = Regex::new( &needle_fixed).unwrap();

assert!( regex.is_match( r#"a]b"#));
assert!( regex.is_match( r#"aa]bb"#));
assert!( regex.is_match( r#"a?b"#));
assert!( regex.is_match( r#"a\b"#));

// and it is also possible to convert this regex compatible regexpression
// to a grep compatible regexpressions :

let needle2 = rqf.fix( &needle_fixed);

assert_eq!( needle, needle2);

还可以使用自由定义的引号字符进行操作

use regex_quote_fixer::RegexQuoteFixer;
use regex_quote_fixer::CharacterClass;

let rqf = RegexQuoteFixer {
 lambda: Box::new(|x| x == 'b'),
 quote_char: 'c',
 cc: CharacterClass::Ignore,
};
let s1 = "abcccbd";
let s2 = rqf.fix( s1);
assert_eq!( s2, "acbccbd");
let s3 = rqf.fix( &s2);
assert_eq!( s1, s3);