正则表达式的应用(Seaskyer)

最新推荐文章于 2025-08-08 16:46:01 发布

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最新推荐文章于 2025-08-08 16:46:01 发布

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分类专栏： [12]正则表达式的应用文章标签：正则表达式 string regex sql url html

本文链接：https://blog.youkuaiyun.com/xbf321/article/details/1557432

[12]正则表达式的应用专栏收录该内容

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本文介绍了一系列实用的正则表达式应用场景，包括字符串验证、URL路径转换、从HTML代码中提取图片及文件URL等，并提供了SQL和Oracle参数提取的方法，最后展示了如何将HTML代码转换为纯文本。

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#region 正则表达式的使用

        /// <summary>
        /// 判断输入的字符串是否完全匹配正则
        /// </summary>
        /// <param name="RegexExpression">正则表达式</param>
        /// <param name="str">待判断的字符串</param>
        /// <returns></returns>
        public static bool IsValiable(string RegexExpression, string str)
        {
            bool blResult = false;

            Regex rep = new Regex(RegexExpression, RegexOptions.IgnoreCase);

            //blResult = rep.IsMatch(str);
            Match mc = rep.Match(str);

            if(  mc.Success )
            {
                if( mc.Value == str ) blResult = true;
            }

            return blResult;
        }

        /// <summary>
        /// 转换代码中的URL路径为绝对URL路径
        /// </summary>
        /// <param name="sourceString">源代码</param>
        /// <param name="replaceURL">替换要添加的URL</param>
        /// <returns>string</returns>
        public static string convertURL(string sourceString,string replaceURL)
        {
            Regex rep = new Regex(" (src|href|background|value)=('|"|)([^('|"|)http://].*?)('|"| |>)");
            sourceString = rep.Replace(sourceString," $1=$2" + replaceURL + "$3$4");

            return sourceString;
        }

        /// <summary>
        /// 获取代码中所有图片的以HTTP开头的URL地址
        /// </summary>
        /// <param name="sourceString">代码内容</param>
        /// <returns>ArrayList</returns>
        public static ArrayList GetImgFileUrl(string sourceString)
        {
            ArrayList imgArray = new ArrayList();

            Regex r = new Regex("<IMG(.*?)src=('|"|)(http://.*?)('|"| |>)", RegexOptions.IgnoreCase|RegexOptions.Compiled);

            MatchCollection mc =  r.Matches(sourceString);
            for (int i = 0; i < mc.Count; i++)
            {
                if( !imgArray.Contains(mc[i].Result("$3")) )
                {
                    imgArray.Add(mc[i].Result("$3"));
                }
            }

            return imgArray;
        }

        /// <summary>
        /// 获取代码中所有文件的以HTTP开头的URL地址
        /// </summary>
        /// <param name="sourceString">代码内容</param>
        /// <returns>ArrayList</returns>
        public static Hashtable getFileUrlPath(string sourceString)
        {
            Hashtable url = new Hashtable();

            Regex r = new Regex(" (src|href|background|value)=('|"|)(http://.*?)('|"| |>)",
                RegexOptions.IgnoreCase|RegexOptions.Compiled);

            MatchCollection mc =  r.Matches(sourceString);
            for (int i = 0; i < mc.Count; i++)
            {
                if( !url.ContainsValue(mc[i].Result("$3")) )
                {
                    url.Add(i, mc[i].Result("$3"));
                }
            }

            return url;
        }

        /// <summary>
        /// 获取一条SQL语句中的所参数
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <returns></returns>
        public static ArrayList SqlParame(string sql)
        {
            ArrayList list = new ArrayList();
            Regex r = new Regex(@"@(?<x>[0-9a-zA-Z]*)", RegexOptions.IgnoreCase|RegexOptions.Compiled);
            MatchCollection mc =  r.Matches(sql);
            for(int i = 0; i < mc.Count; i++)
            {
                list.Add(mc[i].Result("$1"));
            }

            return list;
        }

        /// <summary>
        /// 获取一条SQL语句中的所参数
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <returns></returns>
        public static ArrayList OracleParame(string sql)
        {
            ArrayList list = new ArrayList();
            Regex r = new Regex(@":(?<x>[0-9a-zA-Z]*)", RegexOptions.IgnoreCase|RegexOptions.Compiled);
            MatchCollection mc =  r.Matches(sql);
            for(int i = 0; i < mc.Count; i++)
            {
                list.Add(mc[i].Result("$1"));
            }

            return list;
        }

        /// <summary>
        /// 将HTML代码转化成纯文本
        /// </summary>
        /// <param name="sourceHTML">HTML代码</param>
        /// <returns></returns>
        public static string convertText(string sourceHTML)
        {
//            string strResult = "";
//            Regex r = new Regex(">(.*?)<", RegexOptions.IgnoreCase|RegexOptions.Compiled);
//            MatchCollection mc =  r.Matches(sourceHTML);
//
//            if( mc.Count == 0 )
//            {
//                strResult = sourceHTML;
//            }
//            else
//            {
//                for(int i = 0; i < mc.Count; i++)
//                {
//                    strResult += mc[i].Result("$1");
//                }
//            }

            string strResult = "";
            Regex r = new Regex("<(.*?)>", RegexOptions.IgnoreCase|RegexOptions.Compiled);
            MatchCollection mc =  r.Matches(sourceHTML);

            if( mc.Count == 0 )
            {
                strResult = sourceHTML;
            }
            else
            {
                strResult = sourceHTML;

                for(int i = 0; i < mc.Count; i++)
                {
                    strResult = strResult.Replace(mc[i].ToString(), "");
                }
            }

            return strResult;
        }
        #endregion