Java HtmlToText类：标签过滤器实现

public class HtmlToText {
private static final String regEx_script    = "<script[^>]*?>[\\s\\S]*?<\\/script>";        /* 定义script的正则表达式 */  
    private static final String regEx_style = "<style[^>]*?>[\\s\\S]*?<\\/style>";          /* 定义style的正则表达式 */  
    private static final String regEx_html  = "<[^>]+>";                                    /* 定义HTML标签的正则表达式<[^>]*> */  
    private static final String regEx_space = "<a>\\s*|\t|\r|\n</a>";                       /* 定义空格回车换行符 */  
    private static final String regEx_special = "\\&[a-zA-Z]{1,10};";

    public static String delHTMLTag( String htmlStr )  
    {  
     /* 去掉script标签 */  
        Pattern p_script = Pattern.compile( regEx_script,  
                            Pattern.CASE_INSENSITIVE );  
        Matcher m_script = p_script.matcher( htmlStr );  
        htmlStr = m_script.replaceAll( "" );    /* 过滤script标签 */  
        /* 去掉style标签 */  
        Pattern p_style = Pattern  
                  .compile( regEx_style, Pattern.CASE_INSENSITIVE );  
        Matcher m_style = p_style.matcher( htmlStr );  
        htmlStr = m_style.replaceAll( "" );     /* 过滤style标签 */  
        /* 去掉html标签 */  
        Pattern p_html  = Pattern.compile( regEx_html, Pattern.CASE_INSENSITIVE );  
        Matcher m_html  = p_html.matcher( htmlStr );  
        htmlStr = m_html.replaceAll( "" );      /* 过滤html标签 */  
        /* 去掉空格 */  
        Pattern p_space = Pattern  
                  .compile( regEx_space, Pattern.CASE_INSENSITIVE );  
        Matcher m_space = p_space.matcher( htmlStr );  
        htmlStr = m_space.replaceAll( "" );     /* 过滤空格回车标签 */  
        Pattern p_special = Pattern  
                .compile( regEx_special, Pattern.CASE_INSENSITIVE );