Microsoft JScript - Search and replace in a text file using regex

search_and_replace.jse

try
{
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var shell = new ActiveXObject("WScript.Shell");
    var READ = 1, WRITE = 2, APPEND = 8;
    var TEXT_DEFAULT = -2, TEXT_UNICODE = -1, TEXT_ANSI = 0;

    var argc = WScript.Arguments.Count();
    if (argc < 4)
    {
        WScript.Echo("<infile> <outfile> <search> <replace> [flags]");
        WScript.Quit(1);
    }

    var infile = WScript.Arguments.Item(0);
    var outfile = WScript.Arguments.Item(1);
    var search = WScript.Arguments.Item(2);
    var replace = WScript.Arguments.Item(3);
    var flags = "";
    if (argc > 4)
    {
        flags = WScript.Arguments.Item(4);
    }
    var quiet = flags.search("q") > -1;
    var reflags = flags.replace("q", "");

    if (!quiet)
    {
        WScript.Echo("infile :", infile);
        WScript.Echo("outfile:", outfile);
        WScript.Echo("search :", search);
        WScript.Echo("replace:", replace);
        WScript.Echo("flags  :", flags);
    }

    var regex = new RegExp(search, reflags);

    file = fso.OpenTextFile(infile, READ);
    str = file.ReadAll();
    file.Close();

    str = str.replace(regex, replace);

    file = fso.OpenTextFile(outfile, WRITE, true);
    file.Write(str);
    file.Close();
}
catch(ex)
{
    WScript.Echo(ex.name + ": " + ex.description + " / " 
            + ex.message + " (" + ex.number + ")");
    WScript.Quit(1);
}