55128.cn_zt/ThematicArticleSpider/Common/RegexHelper.cs

using System.Text.RegularExpressions;

namespace Common
{
    /// <summary>
    /// 操作正则表达式的公共类
    /// </summary>    
    public class RegexHelper
    {
        #region 验证输入字符串是否与模式字符串匹配

        /// <summary>
        /// 验证输入字符串是否与模式字符串匹配，匹配返回true
        /// </summary>
        /// <param name="input">输入的字符串</param>
        /// <param name="pattern">模式字符串</param>
        /// <param name="options">筛选条件</param>
        public static bool IsMatch(string input, string pattern, RegexOptions options = RegexOptions.IgnoreCase)
        {
            return Regex.IsMatch(input, pattern, options);
        }

        /// <summary>
        /// 获取第一个匹配到的字符串
        /// </summary>
        /// <param name="input"></param>
        /// <param name="pattern"></param>
        /// <param name="options"></param>
        /// <returns></returns>
        public static string GetMatchResult(string input, string pattern, RegexOptions options = RegexOptions.IgnoreCase)
        {
            if (IsMatch(input, pattern))
            {
                Regex regex = new Regex(pattern, options);

                MatchCollection collection = regex.Matches(input);

                GroupCollection groupCollection = collection[0].Groups;

                return groupCollection[0].Value;
            }
            return "";
        }

        #endregion
    }
}