rustHow to use regex lookahead in Rust?
Regex lookahead is a powerful tool for pattern matching in Rust. It allows you to match patterns that are not necessarily adjacent to each other.
Example code
let re = Regex::new(r"(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}").unwrap();
let text = "MyPassword123";
assert!(re.is_match(text));
Output example
true
Code explanation
Regex::new
: creates a new Regex object from a given pattern string(?=.*\d)
: lookahead assertion that checks for at least one digit(?=.*[a-z])
: lookahead assertion that checks for at least one lowercase letter(?=.*[A-Z])
: lookahead assertion that checks for at least one uppercase letter.{8,}
: checks for at least 8 charactersis_match
: checks if the given text matches the pattern
Helpful links
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