regex match number
For matching an integer number of one single char/digit, specify:
[0-9]
But for matching any number of more than one char/digit; add "+":
[0-9]+
Example for matching hour with minutes of HH:MM format in a file:
grep "[0-9]+:[0-9]+" file.txtcount matches with regex
use regex::Regex;
fn main() {
// count matches with regex
let re = Regex::new(r"(?i)th").unwrap();
let result = re.find_iter("The three truths.").count();
println!("result = {}", result); // 3
}Copyright © 2021 Codeinu
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