HackerRank Detect the Email Addresses Solution

#include <cmath>
#include <cstdio>
#include <vector>
#include <set>
#include <iostream>
#include <algorithm>
using namespace std;
vector<string> split(string s, char delimiter){
    vector<string> result;
    string t = "";
    for(int i = 0; i < s.length(); i++){
        
        if(s[i] == delimiter || s[i] == '\t'){
            
            if(t!="") {
                result.push_back(t);
                t="";
            }
        }
        else {
            //cout<<s[i];
            t+=s[i];
        }
    }
    if(t!="") result.push_back(t);
    return result;
}
bool isEmail(string s){
    bool email = false;
    int i = 0;
    int len = s.length();
    while(i < len && s[i]!='@')i++;
    if(i!=len) {
        i+=1;
        if(i < len && s[i] != '.') {
            while(i < len && s[i]!='.') i++;
            if(i!=len){
               email = true;
            }
        }
    }
    return email;
}
int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int n;
    cin>>n;
    string s;
    getline(cin,s);
    set<string> emails;
    while(n--){
        getline(cin,s);
        vector<string> spt = split(s,' ');
        for(int i = 0; i < spt.size(); i++){
            //cout<<spt[i]<<endl;
            if(isEmail(spt[i])) {
                int j;
                for(j = spt[i].length() - 1; j>=0; j--) {
                    if(spt[i][j] != '.' && spt[i][j] != '!') break; 
                }
                emails.insert(spt[i].substr(0,j+1));
            }
        }
    }
    string result = "";
    for(set<string>::iterator it = emails.begin(); it != emails.end(); it++){
        result+= *it + ";";
    }
    cout<<result.substr(0,result.length() -1)<<endl;
    return 0;
}

/**
 * 
 */
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 * @author Antonio081014
 * @since Sep 19, 2013, 3:46:51 PM
 */
public class Solution {
	public static void main(String[] args) {
		Solution main = new Solution();
		main.run();
		System.exit(0);
	}
	private void run() {
		try {
			BufferedReader in = new BufferedReader(new InputStreamReader(
					System.in));
			HashSet<String> emails = new HashSet<String>();
			int N = Integer.parseInt(in.readLine());
			for (int i = 0; i < N; i++) {
				String[] s = in.readLine().split("\\s");
				for (int j = 0; j < s.length; j++) {
					// s[j] = s[j].replaceAll("[^[email protected]]", "");
					if (isEmail(s[j])) {
						// s[j].replaceAll("(\\b)[\\W]*", "");
						s[j] = trans(s[j]);
						emails.add(s[j]);
					}
				}
			}
			ArrayList<String> list = new ArrayList<String>(emails);
			Collections.sort(list);
			System.out.print(list.get(0));
			for (int i = 1; i < list.size(); i++)
				System.out.print(";" + list.get(i));
			System.out.println();
		} catch (Exception e) {
		}
	}
	private boolean isEmail(String s) {
		// String pattern = "^(\\w)[email protected](\\w)+.(\\w)+[\\W]*";
		// String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
		// + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
		// Pattern VALID_EMAIL_ADDRESS_REGEX = Pattern.compile(
		// "^[A-Z0-9._%+-][email protected][A-Z0-9.-]+\\.[A-Z]{2,6}$",
		// Pattern.CASE_INSENSITIVE);
		Pattern pattern = Pattern
				.compile("[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})");
		Matcher matcher = pattern.matcher(s);
		return matcher.find();
		// return s.matches(EMAIL_PATTERN);
	}
	private String trans(String s) {
		for (int i = s.length() - 1; i >= 0; i--) {
			if ((s.charAt(i) >= 'a' && s.charAt(i) <= 'z')
					|| (s.charAt(i) >= 'A' && s.charAt(i) <= 'Z')
					|| (s.charAt(i) >= '0' && s.charAt(i) <= '9')) {
				return s.substring(0, i + 1);
			} else {
				continue;
			}
		}
		return "";
	}
}

import sys,re
tc=int(raw_input())
r=re.compile(r"[a-zA-Z_.-0-9+][email protected][a-zA-Z0-9.]+[a-zA-Z]+")
emailIds=[]
lines=[]
for _ in range(tc):
    line=sys.stdin.readline().strip()
    lines.append(line)
for line in lines:
    emails=re.findall(r,line)
    for email in emails:
        emailIds.append(email.strip())
emailIds=list(set(emailIds))
s=''
for e in sorted(emailIds):
    s+=e+';'
print s[:-1]

function processData(input) {
    var match = input.match(/(([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4}))((;(([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})))*)(;{0,1})/gi);
    if(match){
        var str = [];
        for(var i = 0; i < match.length; i++){
            if(str.indexOf(match[i]) == -1){
               str.push(match[i]);
               }
            
        }
        str.sort();
        console.log(str.join(";"));
    }else{
        return 0;
    }
} 
process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});
process.stdin.on("end", function () {
   processData(_input);
});

<?php
    $f = fopen("php://stdin", "r");
    $numLines = fgets( $f );
    $total = "";
    while( $line = fgets( $f ) ) $total .= $line;
    $matches = array();
    preg_match_all( '/\b[a-z_-]+[\.a-z_-][email protected][a-z_-]+\.[a-z_-]+[\.a-z_-]+?\b/siU', $total, $matches );
    asort( $matches[ 0 ] );
    $colon = "";
    foreach( array_unique( $matches[ 0 ] ) as $match )
    {
        print $colon . $match;
        $colon =";";
    }
?>