using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"<img[^>]*alt=""([^""]+)""[^>]*>";
string substitution = @"\g<1>";
string input = @"<span itemprop=""description""> <img src=""//res.smzdm.com/images/emotions/30.png"" alt=""[小怒]"" class=""wp-smiley""> <img src=""//res.smzdm.com/images/emotions/30.png"" alt=""[小怒]"" class=""wp-smiley""> <img src=""//res.smzdm.com/images/emotions/30.png"" alt=""[小怒]"" class=""wp-smiley""> 这文章百度哪里搬来的 </span>
<span itemprop=""description""> <img src=""//res.smzdm.com/images/emotions/36.png"" alt=""[喜极而泣]"" class=""wp-smiley""> 年少无知看了那篇文章好奇买了4瓶 喝了一口差点吐出来 </span>
<span itemprop=""description"">国内咋就没厂商做点纯气泡水呢,成本应该不高吧,钱都让屈臣氏巴黎水赚去了 <img src=""//res.smzdm.com/images/emotions/23.png"" alt=""[皱眉]"" class=""wp-smiley""> </span>
<span itemprop=""description"">小时候就经常煲来喝,利尿排毒 <img src=""//res.smzdm.com/images/emotions/45.png"" alt=""[抽烟]"" class=""wp-smiley""> </span>
<p class=""p_content_166651051""><span itemprop=""description"">我喜欢香草味的,滑滑的感觉 </span></p>
<p class=""p_content_166650868""><span itemprop=""description"">我喝过好几箱,后来还回购了,再后来就喝不起了,太贵[皱眉] </span></p>";
RegexOptions options = RegexOptions.Multiline;
Regex regex = new Regex(pattern, options);
string result = regex.Replace(input, substitution);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx