src/Library/NetPro.Web.Api/Helper/RegexHelper.cs

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using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace NetPro
{
    /// <summary>
    /// 正则操作
    /// </summary>
    internal static class RegexHelper
    {
        /// <summary>
        /// 获取匹配值集合
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <param name="pattern">模式字符串</param>
        /// <param name="resultPatterns">结果模式字符串数组,范例：new[]{"$1","$2"}</param>
        /// <param name="options">选项</param>
        public static Dictionary<string, string> GetValues(string input, string pattern, string[] resultPatterns, RegexOptions options = RegexOptions.IgnoreCase)
        {
            var result = new Dictionary<string, string>();
            if (string.IsNullOrWhiteSpace(input))
                return result;
            var match = Regex.Match(input, pattern, options);
            if (match.Success == false)
                return result;
            AddResults(result, match, resultPatterns);
            return result;
        }

        /// <summary>
        /// 添加匹配结果
        /// </summary>
        private static void AddResults(Dictionary<string, string> result, Match match, string[] resultPatterns)
        {
            if (resultPatterns == null)
            {
                result.Add(string.Empty, match.Value);
                return;
            }
            foreach (var resultPattern in resultPatterns)
                result.Add(resultPattern, match.Result(resultPattern));
        }

        /// <summary>
        /// 获取匹配值
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <param name="pattern">模式字符串</param>
        /// <param name="resultPattern">结果模式字符串,范例："$1"用来获取第一个()内的值</param>
        /// <param name="options">选项</param>
        public static string GetValue(string input, string pattern, string resultPattern = "", RegexOptions options = RegexOptions.IgnoreCase)
        {
            if (string.IsNullOrWhiteSpace(input))
                return string.Empty;
            var match = Regex.Match(input, pattern, options);
            if (match.Success == false)
                return string.Empty;
            return string.IsNullOrWhiteSpace(resultPattern) ? match.Value : match.Result(resultPattern);
        }