关于字符串替换问题

Question

replace 替换 img，htmlimgreplace标签替换

Answer 1

正则 (?is)(?<=<img src=\")[^\"]+(?=\")

Answer 2

批量替换字符串
  private void btn_replace_Click(object sender, EventArgs e)
        {
            txt_str.Text = //使用字符串对象的Reaplce方法替换所有满足条件的字符串
                txt_str.Text.Replace(txt_find.Text, txt_replace.Text);
        }
 // 使用代码编辑器修改此方法的内容。
             private void InitializeComponent()
        {
            this.btn_replace = new System.Windows.Forms.Button();
            this.txt_str = new System.Windows.Forms.TextBox();
            this.txt_find = new System.Windows.Forms.TextBox();
            this.txt_replace = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.SuspendLayout();
                     this.btn_replace.Location = new System.Drawing.Point(226, 239);
            this.btn_replace.Name = "btn_replace";
            this.btn_replace.Size = new System.Drawing.Size(75, 23);
            this.btn_replace.TabIndex = 0;
            this.btn_replace.Text = "替换";
            this.btn_replace.UseVisualStyleBackColor = true;
            this.btn_replace.Click += new System.EventHandler(this.btn_replace_Click);
                    this.txt_str.Location = new System.Drawing.Point(0, 2);
            this.txt_str.Multiline = true;
            this.txt_str.Name = "txt_str";
            this.txt_str.Size = new System.Drawing.Size(315, 202);
            this.txt_str.TabIndex = 1;
                  this.txt_find.Location = new System.Drawing.Point(107, 212);
            this.txt_find.Name = "txt_find";
            this.txt_find.Size = new System.Drawing.Size(100, 21);
            this.txt_find.TabIndex = 2;
                     this.txt_replace.Location = new System.Drawing.Point(107, 239);
            this.txt_replace.Name = "txt_replace";
            this.txt_replace.Size = new System.Drawing.Size(100, 21);
            this.txt_replace.TabIndex = 3;
                  this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(26, 216);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(77, 12);
            this.label1.TabIndex = 4;
            this.label1.Text = "查找字符串：";
                      this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(26, 243);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(77, 12);
            this.label2.TabIndex = 5;
            this.label2.Text = "替换字符串：";
                     this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(313, 271);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.txt_replace);
            this.Controls.Add(this.txt_find);
            this.Controls.Add(this.txt_str);
            this.Controls.Add(this.btn_replace);
            this.Name = "Frm_Main";
            this.Text = "批量替换某一类字符串";
            this.ResumeLayout(false);
            this.PerformLayout();        }

Answer 3

灰常简单，正则匹配然后替换，所有的代码都在这里：
http://www.hellocsharp.com/ask/15.aspx