Common下RegHelper.cs

最新推荐文章于 2024-05-08 20:56:44 发布

原创最新推荐文章于 2024-05-08 20:56:44 发布 · 619 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#regex #string #include #div #html #class

架构专栏收录该内容

16 篇文章

订阅专栏

本文介绍了一种使用C#中的正则表达式从HTML字符串中提取图片URL的方法，并提供了获取指定ID的div标签内容的功能。

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

namespace Common
{
    public class RegHelper
    {
        //返回单个路径

        public static string GetImgUrl(string HTMLStr)
        {
            string str = string.Empty;
            //string sPattern = @"^<img/s+[^>]*>";
            Regex r = new Regex(@"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>",
            RegexOptions.Compiled);
            Match m = r.Match(HTMLStr.ToLower());
            if (m.Success)
                str = m.Result("${url}");
            return str;
        }
        //返回多个路径的情况
        public static StringBuilder MyGetImgUrl(string text)
        {
            StringBuilder str = new StringBuilder();
            string pat = @"<img/s+[^>]*/s*src/s*=/s*([']?)(?<url>/S+)'?[^>]*>";

Regex r = new Regex(pat, RegexOptions.Compiled);

            Match m = r.Match(text.ToLower());
            //int matchCount = 0;
            while (m.Success)
            {
                Group g = m.Groups[2];
                str.Append(g).Append(",");
                m = m.NextMatch();
            }
            return str;
        }
        /// <summary>
        /// 根据id过滤div内容
        /// </summary>
        /// <param name="html"></param>
        /// <param name="id">id</param>
        /// <param name="include_div_mask">是否包含div标记</param>
        /// <returns></returns>
        public static string GetDivByID(string html, string id, bool include_div_mask)
        {
            string regex_pattern = string.Format(include_div_mask ? @"(?is)<div[^>]*?id=""{0}.+?</div>" : @"(?is)(?<=<div[^>]*?id=""{0}[^>]+>).+?(?=</div>)", Regex.Escape(id));
            Match m = Regex.Match(html, regex_pattern);
            if (m.Success) return m.Value;
            else return "";
        }