正则表达式的应用(Seaskyer)

最新推荐文章于 2025-04-24 20:42:09 发布

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最新推荐文章于 2025-04-24 20:42:09 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

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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