Java tutorial
//package com.java2s; /* * This is the source code of Telegram for Android v. 3.x.x. * It is licensed under GNU GPL v. 2 or later. * You should have received a copy of the license in this archive (see LICENSE). * * Copyright Nikolai Kudashov, 2013-2016. */ import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static Pattern pattern = Pattern.compile("[0-9]+"); public static String parseIntToString(String value) { Matcher matcher = pattern.matcher(value); if (matcher.find()) { return matcher.group(0); } return null; } }