Assign to string x the first word of string s consisting of exactly 3 digits, or the empty string if no such match exists.A word containing more digits, or 3 digits as a substring fragment, must not match.
#include <regex>
std::regex re("\\b\\d{3}\\b"); auto it = std::sregex_iterator(s.begin(), s.end(), re); std::string x = it == std::sregex_iterator() ? "" : it->str();
using System.Text.RegularExpressions;
string x = Regex.Match(s, @"\b\d\d\d\b").Value;
var re = new Regex(@"\b\d\d\d\b"); string x = re.Match(s).Value;
import "regexp"
re := regexp.MustCompile(`\b\d\d\d\b`) x := re.FindString(s)
const matches = s.match(/\b\d{3}\b/); const x = matches ? matches[0] : '';
uses RegExpr;
with TRegExpr.Create do begin Expression := '\b\d\d\d\b'; Exec(s); x := Match[0]; Free; end;
my ($x) = $s =~ /\b(\d{3})\b/;
import re
m = re.search(r'\b\d\d\d\b', s) x = m.group(0) if m else ''
x = s.match(/\b\d{3}\b/).to_s
use regex::Regex;
let re = Regex::new(r"\b\d\d\d\b").expect("failed to compile regex"); let x = re.find(s).map(|x| x.as_str()).unwrap_or("");
No security, no password. Other people might choose the same nickname.