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== Find the end point of the second "B(ond)" ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainClass {
public static void main(String args[]) {
Pattern p = Pattern.rupile("B(on)d");
String candidateString = "My name is Bond. James Bond.";
String matchHelper[] = { " ^", " ^", " ^",
" ^" };
Matcher matcher = p.matcher(candidateString);
// Find the end point of the second "B(ond)"
matcher.find();
int endIndex = matcher.end(0);
System.out.println(candidateString);
System.out.println(matchHelper[2] + endIndex);
}
}</source>



== Match Duplicate Words ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String args[]) throws Exception {
String duplicatePattern = "\\b(\\w+) \\1\\b";
Pattern p = Pattern.rupile(duplicatePattern);

int matches = 0;
String phrase = "this is a test";
Matcher m = p.matcher(phrase);
String val = null;
while (m.find()) {
val = ":" + m.group() + ":";
System.out.println(val);
matches++;
}
}
}</source>



== Matching Line Boundaries in a Regular Expression ==



<source lang="java">
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Main {
public static void main(String[] argv) throws Exception {
CharSequence inputStr = "abc\ndef";
String patternStr = "abc$";
// Compile with multiline enabled
Pattern pattern = Pattern.rupile(patternStr, Pattern.MULTILINE);
Matcher matcher = pattern.matcher(inputStr);
boolean matchFound = matcher.find(); // true
// Use an inline modifier to enable multiline mode
matchFound = pattern.matches(".*abc$.*", "abc\r\ndef"); // false
matchFound = pattern.matches("(?m).*abc$.*", "abc\r\ndef"); // true
}
}</source>



== Pattern.matches method ==



<source lang="java">
import java.util.regex.Pattern;
public class MainClass {
public static void main(String args[]) {
String regex = "ad*";
String input = "add";
boolean isMatch = Pattern.matches(regex, input);
System.out.println(isMatch);
}
}</source>



== Regex for IP v4 Address ==



<source lang="java">
/*
* $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/util/InetAddressUtils.java $
* $Revision: 652020 $
* $Date: 2008-04-27 22:23:31 +0100 (Sun, 27 Apr 2008) $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/

import java.util.regex.Pattern;
/**
* A collection of utilities relating to InetAddresses.
*/
public class InetAddressUtils {
private InetAddressUtils() {
}

private static final Pattern IPV4_PATTERN =
Pattern.rupile(
"^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$");
private static final Pattern IPV6_STD_PATTERN =
Pattern.rupile(
"^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");
private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
Pattern.rupile(
"^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");
public static boolean isIPv4Address(final String input) {
return IPV4_PATTERN.matcher(input).matches();
}
public static boolean isIPv6StdAddress(final String input) {
return IPV6_STD_PATTERN.matcher(input).matches();
}

public static boolean isIPv6HexCompressedAddress(final String input) {
return IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
}

public static boolean isIPv6Address(final String input) {
return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
}
}</source>



== Regex for IP v6 Address ==



<source lang="java">
/*
* $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/conn/util/InetAddressUtils.java $
* $Revision: 652020 $
* $Date: 2008-04-27 22:23:31 +0100 (Sun, 27 Apr 2008) $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/

import java.util.regex.Pattern;
/**
* A collection of utilities relating to InetAddresses.
*/
public class InetAddressUtils {
private InetAddressUtils() {
}

private static final Pattern IPV4_PATTERN =
Pattern.rupile(
"^(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}$");
private static final Pattern IPV6_STD_PATTERN =
Pattern.rupile(
"^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$");
private static final Pattern IPV6_HEX_COMPRESSED_PATTERN =
Pattern.rupile(
"^((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)$");
public static boolean isIPv4Address(final String input) {
return IPV4_PATTERN.matcher(input).matches();
}
public static boolean isIPv6StdAddress(final String input) {
return IPV6_STD_PATTERN.matcher(input).matches();
}

public static boolean isIPv6HexCompressedAddress(final String input) {
return IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
}

public static boolean isIPv6Address(final String input) {
return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
}
}</source>



== Validate email address ==



<source lang="java">
public class Main {
public static void main(String[] args) {
System.out.println("isValid = " + isValidEmailAddress("user@domain.ru"));
}
static boolean isValidEmailAddress(String email) {
String EMAIL_REGEX = "^[\\w-_\\.+]*[\\w-_\\.]\\@([\\w]+\\.)+[\\w]+[\\w]$";
return email.matches(EMAIL_REGEX);
}
}</source>

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