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实例三：
数据提取
要求：从一段HTML代码中提取出所有的email地址和<a href...>tag中的链接地址 public class HtmlTest {
public static void main(String[] args) {
String htmlText = "<html>"
+ "<a href=\"testone@163.com\">163test</a>\n"
+ "<a href='www.163.com@163-com.com'>163news</a>\n"
+ "<a href=http://www.163.com>163lady</a>\n"
+ "<a href = http://sports.163.com>网易体育</a>\n"
+ "<a href = \"http://gz.house.163.com\">网易房产</a>\n"
+ ".leemaster@163" + "luckdog.com" + "</html>";
System.out.println("开始检查email");
for (String email : extractEmail(htmlText)) {
System.out.println("邮箱是:" + email);
}
System.out.println("开始检查超链接");
for (String link : extractLink(htmlText)) {
System.out.println("超链接是:" + link);
}
}
private static List<String> extractLink(String htmlText) {
List<String> result = new ArrayList<String>();
Pattern p = Pattern.compile(Regexes.HREF_LINK_REGEX);
Matcher m = p.matcher(htmlText);
while (m.find()) {
result.add(m.group());
}
return result;
}
private static List<String> extractEmail(String htmlText) {
List<String> result = new ArrayList<String>();
Pattern p = Pattern.compile(Regexes.EMAIL_REGEX);
Matcher m = p.matcher(htmlText);
while (m.find()) {
result.add(m.group());
}
return result;
}
}
public class Regexes {
public static final String EMAIL_REGEX =
"(?i)(?<=\\b)[a-z0-9][-a-z0-9_.]+[a-z0-9]@([a-z0-9][-a-z0-9]+\\.)+[a-z]{2,4}(?=\\b)";
public static final String HREF_LINK_REGEX
= "(?i)<a\\s+href\\s*=\\s*['\"]?([^'\"\\s>]+)['\"\\s>]";
}
运行结果：
开始检查email
邮箱是:testone@163.com
邮箱是:www.163.com@163-com.com
邮箱是:leemaster@163luckdog.com
开始检查超链接
超链接是:<a href="testone@163.com"
超链接是:<a href='www.163.com@163-com.com'
超链接是:<a href=http://www.163.com>
超链接是:<a href = http://sports.163.com>
超链接是:<a href = "http://gz.house.163.com" 实例四：
查找重复单词
要求：查找一段文本中是否存在重复单词，如果存在，去掉重复单词。
public class FindWord {
public static void main(String[] args) {
String[] sentences = new String[] { "this is a normal sentence",
"Oh,my god!Duplicate word word",
"This sentence contain no duplicate word words" };
for(String sentence:sentences){
System.out.println("校验句子:"+sentence);
if(containDupWord(sentence)){
System.out.println("Duplicate word found!!");
System.out.println("正在去除重复单词"+removeDupWords(sentence));
}
System.out.println("");
}
}
private static String removeDupWords(String sentence) {
String regex = Regexes.DUP_WORD_REGEX;
return sentence.replaceAll(regex,"$1");
}
private static boolean containDupWord(String sentence) {
String regex = Regexes.DUP_WORD_REGEX;
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(sentence);
if(m.find()){
return true;
}else{
return false;
}
}
}
public class Regexes {
public static final String DUP_WORD_REGEX
= "(?<=\\b)(\\w+)\\s+\\1(?=\\b)";
}
运行结果：
校验句子:this is a normal sentence
校验句子:Oh,my god!Duplicate word word
Duplicate word found!!
正在去除重复单词Oh,my god!Duplicate word
校验句子:This sentence contain no duplicate word words
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奈斯
