rustHow to replace strings using Rust regex?
Rust regex can be used to replace strings in a variety of ways. The replace
method can be used to replace all occurrences of a pattern with a given string. For example:
let re = Regex::new(r"(\w+)").unwrap();
let before = "Hello World";
let after = re.replace_all(before, "Goodbye");
println!("{}", after);
Output example
GoodbyeGoodbye
The code above uses the Regex::new
method to create a new Regex object, which is then used to call the replace_all
method. This method takes two arguments: the string to be replaced and the string to replace it with. In this case, all occurrences of the pattern (\w+)
are replaced with the string Goodbye
.
Alternatively, the replace_all
method can also take a closure as its second argument. This closure can be used to perform more complex replacements, such as replacing each occurrence of a pattern with a different string. For example:
let re = Regex::new(r"(\w+)").unwrap();
let before = "Hello World";
let after = re.replace_all(before, |caps: &Captures| {
let word = caps[1].to_string();
match word.as_str() {
"Hello" => "Goodbye".to_string(),
"World" => "Universe".to_string(),
_ => word,
}
});
println!("{}", after);
Output example
GoodbyeUniverse
In this example, the closure takes a Captures
object as its argument, which contains the matched pattern. The closure then uses a match
expression to check the matched pattern and return the appropriate replacement string.
Helpful links
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See more codes...