C#

public class Form1 : Form<br />
    {<br />
<br />
/// <summary><br />
        /// Required designer variable.<br />
        /// </summary><br />
        private System.ComponentModel.IContainer components = null;<br />
<br />
        /// <summary><br />
        /// Clean up any resources being used.<br />
        /// </summary><br />
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param><br />
        protected override void Dispose(bool disposing)<br />
        {<br />
            if (disposing && (components != null))<br />
            {<br />
                components.Dispose();<br />
            }<br />
            base.Dispose(disposing);<br />
        }<br />
<br />
        #region Windows Form Designer generated code<br />
<br />
        /// <summary><br />
        /// Required method for Designer support - do not modify<br />
        /// the contents of this method with the code editor.<br />
        /// </summary><br />
        private void InitializeComponent()<br />
        {<br />
            this.webBrowser1 = new System.Windows.Forms.WebBrowser();<br />
            this.button1 = new System.Windows.Forms.Button();<br />
            this.textBox1 = new System.Windows.Forms.TextBox();<br />
            this.button2 = new System.Windows.Forms.Button();<br />
            this.SuspendLayout();<br />
            // <br />
            // webBrowser1<br />
            // <br />
            this.webBrowser1.Dock = System.Windows.Forms.DockStyle.Bottom;<br />
            this.webBrowser1.Location = new System.Drawing.Point(0, 127);<br />
            this.webBrowser1.MinimumSize = new System.Drawing.Size(20, 20);<br />
            this.webBrowser1.Name = "webBrowser1";<br />
            this.webBrowser1.Size = new System.Drawing.Size(461, 257);<br />
            this.webBrowser1.TabIndex = 0;<br />
            // <br />
            // button1<br />
            // <br />
            this.button1.Dock = System.Windows.Forms.DockStyle.Top;<br />
            this.button1.Location = new System.Drawing.Point(0, 0);<br />
            this.button1.Name = "button1";<br />
            this.button1.Size = new System.Drawing.Size(461, 23);<br />
            this.button1.TabIndex = 1;<br />
            this.button1.Text = "button1";<br />
            this.button1.UseVisualStyleBackColor = true;<br />
            this.button1.Click += new System.EventHandler(this.button1_Click);<br />
            // <br />
            // textBox1<br />
            // <br />
            this.textBox1.Location = new System.Drawing.Point(22, 30);<br />
            this.textBox1.Name = "textBox1";<br />
            this.textBox1.Size = new System.Drawing.Size(377, 20);<br />
            this.textBox1.TabIndex = 2;<br />
            // <br />
            // button2<br />
            // <br />
            this.button2.Location = new System.Drawing.Point(0, 56);<br />
            this.button2.Name = "button2";<br />
            this.button2.Size = new System.Drawing.Size(461, 23);<br />
            this.button2.TabIndex = 3;<br />
            this.button2.Text = "button2";<br />
            this.button2.UseVisualStyleBackColor = true;<br />
            this.button2.Click += new System.EventHandler(this.button2_Click);<br />
            // <br />
            // Form1<br />
            // <br />
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);<br />
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;<br />
            this.ClientSize = new System.Drawing.Size(461, 384);<br />
            this.Controls.Add(this.button2);<br />
            this.Controls.Add(this.textBox1);<br />
            this.Controls.Add(this.button1);<br />
            this.Controls.Add(this.webBrowser1);<br />
            this.Name = "Form1";<br />
            this.Text = "Form1";<br />
            this.Load += new System.EventHandler(this.Form1_Load);<br />
            this.ResumeLayout(false);<br />
            this.PerformLayout();<br />
<br />
        }<br />
<br />
        #endregion<br />
<br />
        private System.Windows.Forms.WebBrowser webBrowser1;<br />
        private System.Windows.Forms.Button button1;<br />
        private System.Windows.Forms.TextBox textBox1;<br />
        private System.Windows.Forms.Button button2;<br />
<br />
<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            this.webBrowser1.Navigate("about:blank");<br />
        }<br />
<br />
        private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            this.webBrowser1.Document.Body.InnerHtml += "<br />Clicked!";<br />
        }<br />
<br />
        private void button2_Click(object sender, EventArgs e)<br />
        {<br />
            this.webBrowser1.Document.Body.InnerHtml += "<br />" + this.textBox1.Text;<br />
        }<br />
    }

<br />
Lead Overview: <br />
=========== <br />
Lead ID Number:         1234567 <br />
Prospect Name:          Some Prospect<br />
Prospect Contact:       Some Contact<br />
Prospect Phone:         1234567890 <br />
<br />
Marketing Campaign:     Marketing Campaign Example<br />
<br />
Prospect Information: <br />
=============== <br />
Company Name<br />
Address1, Address2 <br />
New York, NY <br />
United States, 12345 <br />
<br />
Contact Name:   Some Contact <br />
Contact Phone:  1234567890 <br />
Company Email:  contact@email.com <br />

string sMatch = @" Lead Overview: 
=========== 
Lead ID Number: 1234567 
Prospect Name: Some Prospect
Prospect Contact: Some Contact
Prospect Phone: 1234567890 

Marketing Campaign: Marketing Campaign Example

Prospect Information: 
=============== 
Company Name
Address1, Address2 
New York, NY 
United States, 12345 

Contact Name: Some Contact 
Contact Phone: 1234567890 
Company Email: contact@email.com";

bool IsMatchFound = Regex.IsMatch(sMatch, @"Lead\sID\sNumber:\s*(?<LeadNumber>[^\r\n]*)(?:\r\n)+Prospect\sName:.*(?:\r\n)+Prospect\sContact:.*(?:\r\n)+Prospect\sPhone:.*(?:\r\n)+Marketing\sCampaign:.*(?:\r\n)+Prospect\sInformation:\s*(?:\r\n)+===============\s(?:\r\n)+(?<Company>[^\r\n]*)(?:\r\n)+(?<Address1>[^,]*),\s(?<Address2>[^\r\n]*)(?:\r\n)+(?<City>[^,]*),\s(?<State>[^\r\n]*)(?:\r\n)+(?<Country>[^,]*),\s(?<Zip>[^\r\n]*)(?:\r\n)+Contact\sName:\s*(?<FirstName>[^\s]*)\s(?<LastName>[^\r\n]*)(?:\r\n)+Contact\sPhone:\s*(?<Phone>[^\r\n]*)(?:\r\n)+");

1. for some strange reason I cant declare my RegEx string using a literal (using @ when assiging the string) if the literal spans multiple lines, for some reason this is messing with my RegEx.
   Which is why i guess in your example its working.
   
2. the emails are being retrieved from Exchange via WebDAV and for some strange reason line breaks are only coming back as '\n' not '\r\n' like they should. So if I do a .Replace("\n","\r\n") on the body everything works fine.
   I guess this wasnt a problem for your in your example because the email body was assigned as a literal and therefore had the "proper" line breaks (\r\n)