C#

using System.Text.RegularExpressions;

string phpFileText = /* load php file*/;
Regex matcher = new Regex(/* your pattern here */, 
                          /* your options here if not in the pattern itself*/);
Match code = matcher.Match(phpFileText);

while (code.Success)
{
    /* do stuff here */
    code = code.NextMatch();
}

MyObj.subObject[0].ChildObjectName = "My First Sub Object";
MyObj.subObject[0].ChildStream = new MemoryStream() // New Line
MyObj.subObject[0].ChildStream.Position = 0; // (NoLongerAn) ERROR LINE

MyObj.subObject.Add(new myObject.ChildObject());

public class myObject
{
    public List<ChildObject> subObject = new List<ChildObject> { };

    public string ObjectName { get; set; }

    public class ChildObject
    {
        public string ChildObjectName { get; set; }
        public MemoryStream ChildStream { get; set; }

        public ChildObject()
        {
            ChildStream = new MemoryStream();
        }
        ~ChildObject()
        {
            ChildStream.Dispose();
        }
    }
}