You can either use a double backslash each time 

    string foo = &quot;D:\\Projects\\Some\\Kind\\Of\\Pathproblem\\wuhoo.xml&quot;;

or use the @ symbol

    string foo = @&quot;D:\Projects\Some\Kind\Of\Pathproblem\wuhoo.xml&quot;;

Try this:

    string foo = @&quot;D:\Projects\Some\Kind\Of\Pathproblem\wuhoo.xml&quot;;

The problem is that in a string, a `\` is an escape character. By using the `@` sign you tell the compiler to ignore the escape characters.

You can also get by with escaping the `\`:

    string foo = &quot;D:\\Projects\\Some\\Kind\\Of\\Pathproblem\\wuhoo.xml&quot;;


    var foo = @&quot;D:\Projects\Some\Kind\Of\Pathproblem\wuhoo.xml&quot;;

If your string is a file path, as in your example, you can also use Unix style file paths:

    string foo = &quot;D:/Projects/Some/Kind/Of/Pathproblem/wuhoo.xml&quot;;

But the other answers have the more general solutions to string escaping in C#.


    string foo = &quot;D:\\Projects\\Some\\Kind\\Of\\Pathproblem\\wuhoo.xml&quot;;

This will work, or the previous examples will, too. @&quot;...&quot; means treat everything between the quote marks literally, so you can do

    @&quot;Hello
    world&quot;

To include a literal newline. I&#39;m more old school and prefer to escape &quot;\&quot; with &quot;\\\\&quot;

In my Rails template, I&#39;d like to accomplish final HTML to this effect using HAML:

    I will first &lt;a href=&quot;http://example.com&quot;&gt;link somewhere&lt;/a&gt;, then render this half of the sentence if a condition is met

The template that comes close:

    I will first
    = link_to &#39;link somewhere&#39;, &#39;http://example.com&#39;
    - if @condition
      , then render this half of the sentence if a condition is met

You may, however, note that this produces a space between the link and the comma. Is there any practical way to avoid this whitespace? I know there&#39;s syntax to remove whitespace around tags, but can this same syntax be applied to just text? I really don&#39;t like the solution of extra markup to accomplish this.

Haml: Control whitespace around text

For years, I have used the `cmd/DOS/Windows` shell and passed command-line arguments to batch files. For example, I have a file, `zuzu.bat` and in it, I access `%1`, `%2`, etc. Now, I want to do the same when I call a `PowerShell` script `when I am in a Cmd.exe shell`. I have a script, `xuxu.ps1` (and I&#39;ve added PS1 to my PATHEXT variable and associated PS1 files with PowerShell). But no matter what I do, I seem unable to get anything from the `$args` variable. It always has length 0.

If I am in a `PowerShell` shell, instead of `cmd.exe`, it works (of course). But I&#39;m not yet comfortable enough to live in the PowerShell environment full time. I don&#39;t want to type `powershell.exe -command xuxu.ps1 p1 p2 p3 p4`. I want to type `xuxu p1 p2 p3 p4`. 

Is this possible, and if so, how?

The sample I cannot get to work is trivial, foo.ps1:

    Write-Host &quot;Num Args:&quot; $args.Length;
    foreach ($arg in $args) {
        Write-Host &quot;Arg: $arg&quot;;
    }

The results are always like this:

    C:\temp&gt; foo
    Num Args: 0
    C:\temp&gt; foo a b c d
    Num Args: 0
    c:\temp&gt;


How to pass command-line arguments to a PowerShell ps1 file

The following code generates a compiler error about an &quot;unrecognized escape sequence&quot; for each backslash:
    
    string foo = &quot;D:\Projects\Some\Kind\Of\Pathproblem\wuhoo.xml&quot;;

I guess I need to escape backslash? How do I do that?




Unrecognized escape sequence for path string containing backslashes

The following code generates a compiler error about an "unrecognized escape sequence" for each backslash:
<pre><code class="hljs language-ini">string foo = "D:\Projects\Some\Kind\Of\Pathproblem\wuhoo.xml";
</code></pre>
I guess I need to escape backslash? How do I do that?

I am building a custom shopping cart where CC numbers and Exp date will be stored in a database until processing (then deleted). I need to encrypt this data (obviously).

I want to use the RSACryptoServiceProvider class.

Here is my code to create my keys.

    public static void AssignNewKey(){
        const int PROVIDER_RSA_FULL = 1;
        const string CONTAINER_NAME = &quot;KeyContainer&quot;;
        CspParameters cspParams;
        cspParams = new CspParameters(PROVIDER_RSA_FULL);
        cspParams.KeyContainerName = CONTAINER_NAME;
        cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
        cspParams.ProviderName = &quot;Microsoft Strong Cryptographic Provider&quot;;
        rsa = new RSACryptoServiceProvider(cspParams);

        string publicPrivateKeyXML = rsa.ToXmlString(true);
        string publicOnlyKeyXML = rsa.ToXmlString(false);
        // do stuff with keys...
    }


Now the plan is to store the private key xml on a USB drive attached to the managers key chain.


Whenever a manager leaves the company I want to be able to generate new public and private keys (and re-encrypt all currently stored CC numbers with the new public key).

My problem is that the keys generated by this code are always the same. How would I generate a unique set of keys every time?


&lt;strong&gt;UPDATE.&lt;/strong&gt; My test code is below.:&lt;br /&gt;
&lt;em&gt;note: the &quot;privatekey&quot; parameter here is the original private key. In order for the keys to be changed I need to verify that the private key is valid.&lt;/em&gt;

In Default.aspx.cs

    public void DownloadNewPrivateKey_Click(object sender, EventArgs e)
    {
        StreamReader reader = new StreamReader(fileUpload.FileContent);
        string privateKey = reader.ReadToEnd();
        Response.Clear();
        Response.ContentType = &quot;text/xml&quot;;
        Response.End();
        Response.Write(ChangeKeysAndReturnNewPrivateKey(privateKey));
    }

In Crytpography.cs:

    public static privateKey;
    public static publicKey;
    public static RSACryptoServiceProvider rsa;

    public static string ChangeKeysAndReturnNewPrivateKey(string _privatekey)
    {
            
        string testData = &quot;TestData&quot;;
        string testSalt = &quot;salt&quot;;
        // encrypt the test data using the exisiting public key...
        string encryptedTestData = EncryptData(testData, testSalt);
        try
        {
            // try to decrypt the test data using the _privatekey provided by user...
            string decryptTestData = DecryptData(encryptedTestData, _privatekey, testSalt);
            // if the data is successfully decrypted assign new keys...
            if (decryptTestData == testData)
            {
                AssignNewKey();
                // &quot;AssignNewKey()&quot; should set &quot;privateKey&quot; to the newly created private key...
                return privateKey;
            }
            else
            {
                return string.Empty;
            }
        }
        catch (Exception ex)
        {
            return string.Empty;
        }
    }
    public static void AssignParameter(){
        const int PROVIDER_RSA_FULL = 1;
        const string CONTAINER_NAME = &quot;KeyContainer&quot;;
        CspParameters cspParams;
        cspParams = new CspParameters(PROVIDER_RSA_FULL);
        cspParams.KeyContainerName = CONTAINER_NAME;
        cspParams.Flags = CspProviderFlags.UseMachineKeyStore;
        cspParams.ProviderName = &quot;Microsoft Strong Cryptographic Provider&quot;;
        rsa = new RSACryptoServiceProvider(cspParams);
    }
    public static void AssignNewKey()
    {
        AssignParameter();
        
        using (SqlConnection myConn = new SqlConnection(Utilities.ConnectionString))
        {
            SqlCommand myCmd = myConn.CreateCommand();

            string publicPrivateKeyXML = rsa.ToXmlString(true);
            privateKey = publicPrivateKeyXML; // sets the public variable privateKey to the new private key.

            string publicOnlyKeyXML = rsa.ToXmlString(false);
            publicKey = publicOnlyKeyXML; // sets the public variable publicKey to the new public key.

            myCmd.CommandText = &quot;UPDATE Settings SET PublicKey = @PublicKey&quot;;
            myCmd.Parameters.AddWithValue(&quot;@PublicKey&quot;, publicOnlyKeyXML);
            myConn.Open();

            myComm.ExecuteScalar();
        }
    }
    public static string EncryptData(string data2Encrypt, string salt)
    {
        AssignParameter();

        using (SqlConnection myConn = new SqlConnection(Utilities.ConnectionString))
        {
            SqlCommand myCmd = myConn.CreateCommand();

            myCmd.CommandText = &quot;SELECT TOP 1 PublicKey FROM Settings&quot;;

            myConn.Open();

            using (SqlDataReader sdr = myCmd.ExecuteReader())
            {
                if (sdr.HasRows)
                {
                    DataTable dt = new DataTable();
                    dt.Load(sdr);
                    rsa.FromXmlString(dt.Rows[0][&quot;PublicKey&quot;].ToString());
                }
            }
        }

        //read plaintext, encrypt it to ciphertext
        byte[] plainbytes = System.Text.Encoding.UTF8.GetBytes(data2Encrypt + salt);
        byte[] cipherbytes = rsa.Encrypt(plainbytes, false);
        return Convert.ToBase64String(cipherbytes);
    }
    public static string DecryptData(string data2Decrypt, string privatekey, string salt)
    {
        AssignParameter();

        byte[] getpassword = Convert.FromBase64String(data2Decrypt);

        string publicPrivateKeyXML = privatekey;
        rsa.FromXmlString(publicPrivateKeyXML);
 
        //read ciphertext, decrypt it to plaintext
        byte[] plain = rsa.Decrypt(getpassword, false);
        string dataAndSalt = System.Text.Encoding.UTF8.GetString(plain);
        return dataAndSalt.Substring(0, dataAndSalt.Length - salt.Length);
    }

How to Generate Unique Public and Private Key via RSA

Many of my questions here on SO concerns IEquatable implementation. I found it being extremely difficult to implement correctly, because there are many hidden bugs in the na&#239;ve implementation, and the articles I found about it are quite incomplete. I want to find or write a definitive reference which must include:

 * How to implement IEquatable&lt;T&gt; correctly
 * How to override Equals correctly
 * How to override GetHashCode correctly
 * How to implement the ToString method correctly
 * How to implement the operator == correctly
 * How to implement the operator != correctly

Such a complete reference already exists?

PS: Even [MSDN reference](http://msdn.microsoft.com/en-us/library/ms131190.aspx) seems flawed to me

Is there a complete IEquatable implementation reference?

I have an `Item`. `Item` has a `Category`.

`Category` has `ID`, `Name`, **`Parent`** and **`Children`**. `Parent` and `Children` are of `Category` too.

When I do a LINQ to Entities query for a specific `Item`, it doesn&#39;t return the related `Category`, unless I use the `Include(&quot;Category&quot;)` method. But it doesn&#39;t bring the full category, with its parent and children. I could do `Include(&quot;Category.Parent&quot;)`, but this object is something like a tree, I have a recursive hierarchy and I don&#39;t know where it ends.

How can I make EF fully load the `Category`, with parent and children, and the parent with their parent and children, and so on?

This is not something for the whole application, for performance considerations it would be needed only for this specific entity, the Category.

How does Entity Framework work with recursive hierarchies? Include() seems not to work with it

During a code review with a Microsoft employee we came across a large section of code inside a `try{}` block. She and an IT representative suggested this can have effects on performance of the code. In fact, they suggested most of the code should be outside of try/catch blocks, and that only important sections should be checked. The Microsoft employee added and said an upcoming white paper warns against incorrect try/catch blocks.  

I&#39;ve looked around and found it [can affect optimizations](https://blogs.msmvps.com/peterritchie/2007/06/22/performance-implications-of-try-catch-finally/), but it seems to only apply when a variable is shared between scopes.

I&#39;m not asking about maintainability of the code, or even handling the right exceptions (the code in question needs re-factoring, no doubt). I&#39;m also not referring to using exceptions for flow control, this is clearly wrong in most cases. Those are important issues (some are more important), but not the focus here.

How do try/catch blocks affect performance when exceptions are *not* thrown?

Do try/catch blocks hurt performance when exceptions are not thrown?

I see this quiet often in C# documentation. But what does it do?

    public class Car
    {
       public Name { get; set; }
    }



What does this mean ? public Name {get; set;}

What do sender and eventArgs mean/refer to? How can I make use of them (for the scenario below)?

Scenario:

I&#39;m trying to build a custom control with a delete function, and I want to be able to delete the control that was clicked on a page that contains many of the same custom control.

.NET Events - What are object sender &amp; EventArgs e?

I have an application that logs exception strack traces and I wanted those stack traces to include file names and line numbers when deployed in production.  I figured out how to deploy the debug symbols w/ the assembly, but in the process of researching the issue I ran accross [this question][1], which implies that it&#39;s not a good idea to include pdb files in a production environment.  A comment to the accepted answer says &quot;...debugging information can give away sensitive data and be an attack vector. Depending on what your app is.&quot;

So what sort of sensitive data might be exposed?  How can debug symbols be used to compromise an application?  I&#39;m curious about the technical details, but what I&#39;m really looking for is a practical way to evaluate the risk of including debug symbols for any given application and production environment.  Or to put it another way: what&#39;s the worst that could happen?

**EDIT:** follow-up question/clarification

So based on everyone&#39;s answers so far, it seems like this question can be simplified a bit for .NET applications.  This bit from the [John Robbins blog][2] linked in [Michael Maddox&#39;s answer][3] kind of leaped out at me:

&gt; A .NET PDB only contains two pieces of
&gt; information, the source file names and
&gt; their lines and the local variable
&gt; names. All the other information is
&gt; already in the .NET metadata so there
&gt; is no need to duplicate the same
&gt; information in a PDB file.

To me, this reiterates what others have been saying about Reflector, with the implication being that the real issue is access to the assemblies.  Once that&#39;s been determined, the only decision to make with respect to PDBs is whether or not you care about exposing file names, line numbers, and local variable names (assuming that you&#39;re not showing stack traces to end users to begin with).  Or have I oversimplified this too much?

  [1]: https://stackoverflow.com/questions/628565/display-lines-number-in-stack-trace-for-net-assembly-in-release-mode
  [2]: http://www.wintellect.com/CS/blogs/jrobbins/archive/2009/05/11/pdb-files-what-every-developer-must-know.aspx
  [3]: https://stackoverflow.com/questions/1307482/whats-the-risk-of-deploying-debug-symbols-pdb-file-in-a-production-environment/1307544#1307544

What&#39;s the risk of deploying debug symbols (pdb file) in a production environment?

Is there a defined behavior for how regular expressions should handle the capturing behavior of nested parentheses?  More specifically, can you reasonably expect that different engines will capture the outer parentheses in the first position, and nested parentheses in subsequent positions?

Consider the following PHP code (using PCRE regular expressions)

    &lt;?php
      $test_string = &#39;I want to test sub patterns&#39;;
      preg_match(&#39;{(I (want) (to) test) sub (patterns)}&#39;, $test_string, $matches);
      print_r($matches);
    ?&gt;

    Array
    (
		[0] =&gt; I want to test sub patterns	//entire pattern
		[1] =&gt; I want to test			//entire outer parenthesis
		[2] =&gt; want				//first inner
		[3] =&gt; to				//second inner
		[4] =&gt; patterns				//next parentheses set
	)

The entire parenthesized expression is captured first (I want to test), and then the inner parenthesized patterns are captured next (&quot;want&quot; and &quot;to&quot;).  This makes logical sense, but I could see an equally logical case being made for first capturing the sub parentheses, and THEN capturing the entire pattern.

So, is this &quot;capture the entire thing first&quot; defined behavior in regular expression engines, or is it going to depend on the context of the pattern and/or the behavior of the engine (PCRE being different than C#&#39;s being different than Java&#39;s being different than etc.)?

How are nested capturing groups numbered in regular expressions?

Returning a value from thread?

How can I check if a Python object is a string (either regular or Unicode)?

How to find out if a Python object is a string?

Is there a python convention for when you should implement `__str__()` versus `__unicode__()`.  I&#39;ve seen classes override `__unicode__()` more frequently than `__str__()` but it doesn&#39;t appear to be consistent.  Are there specific rules when it is better to implement one versus the other?  Is it necessary/good practice to implement both?


Python __str__ versus __unicode__

I want to create a string and pass it by reference such that I can change a single variable and have that propagate to any other object that references it.

Take this example:

    function Report(a, b) {
    	this.ShowMe = function() { alert(a + &quot; of &quot; + b); }
    }

    var metric = new String(&quot;count&quot;);
    var a = new Report(metric, &quot;a&quot;); 
    var b = new Report(metric, &quot;b&quot;); 
    var c = new Report(metric, &quot;c&quot;); 
    a.ShowMe();  // outputs:  &quot;count of a&quot;;
    b.ShowMe();  // outputs:  &quot;count of b&quot;;
    c.ShowMe();  // outputs:  &quot;count of c&quot;;

I want to be able to have this happen:

    var metric = new String(&quot;count&quot;);
    var a = new Report(metric, &quot;a&quot;); 
    var b = new Report(metric, &quot;b&quot;); 
    var c = new Report(metric, &quot;c&quot;); 
    a.ShowMe();  // outputs:  &quot;count of a&quot;;
    metric = new String(&quot;avg&quot;);
    b.ShowMe();  // outputs:  &quot;avg of b&quot;;
    c.ShowMe();  // outputs:  &quot;avg of c&quot;;

Why doesn&#39;t this work?

The [MDC reference on strings][1] says metric is an object.

I&#39;ve tried this, which is not what I want, but is very close:

    var metric = {toString:function(){ return &quot;count&quot;;}};
    var a = new Report(metric, &quot;a&quot;); 
    var b = new Report(metric, &quot;b&quot;); 
    var c = new Report(metric, &quot;c&quot;); 
    a.ShowMe();  // outputs:  &quot;count of a&quot;;
    metric.toString = function(){ return &quot;avg&quot;;}; // notice I had to change the function
    b.ShowMe();  // outputs:  &quot;avg of b&quot;;
    c.ShowMe();  // outputs:  &quot;avg of c&quot;;

    alert(String(metric).charAt(1)); // notice I had to use the String constructor
    // I want to be able to call this: 
    // metric.charAt(1)


The important points here:

1.  I want to be able to use **metric** like it&#39;s a normal string object
2.  I want each report to reference the same object.

  [1]: https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Global_Objects/String

Pass a string by reference in Javascript

Often when iterating through a string (or any enumerable object), we are not only interested in the current value, but also the position (index). To accomplish this by using `string::iterator` we have to maintain a separate index:

 

    string str (&quot;Test string&quot;);
    string::iterator it;
    int index = 0;
    for ( it = str.begin() ; it &lt; str.end(); it++ ,index++)
    {
        cout &lt;&lt; index &lt;&lt; *it;
    }
      
The style shown above does not seem superior to the &#39;c-style&#39;:

    string str (&quot;Test string&quot;);
    for ( int i = 0 ; i &lt; str.length(); i++)
    {
        cout &lt;&lt; i &lt;&lt; str[i] ;
    }

In Ruby, we can get both content and index in a elegant way:
      
    &quot;hello&quot;.split(&quot;&quot;).each_with_index {|c, i| puts &quot;#{i} , #{c}&quot; }

So, what is the best practice in C++ to iterate through an enumerable object and also keep track of the current index?



How can I iterate through a string and also know the index (current position)?

Is there an efficient mass string concatenation method in Python (like *[StringBuilder][1]* in C# or *StringBuffer* in Java)?

I found following methods [here][2]:

 - Simple concatenation using `+`
 - Using a string list and the `join` method
 - Using `UserString` from the `MutableString` module
 - Using a character array and the `array` module
 - Using `cStringIO` from the `StringIO` module

What should be used and why?

([A related question is here.][3])

  [1]: https://docs.microsoft.com/en-us/dotnet/standard/base-types/stringbuilder
  [2]: http://skymind.com/~ocrow/python_string/
  [3]: https://stackoverflow.com/questions/1349311/python-string-join-is-faster-than-but-whats-wrong-here


What is the most efficient string concatenation method in Python?

I have a command which I am executing from my XAML file using the following standard syntax:

    &lt;Button Content=&quot;Zoom&quot; Command=&quot;{Binding MyViewModel.ZoomCommand}&quot;/&gt;

This worked fine until I realized that I needed TWO pieces of information from the view in order to make this operation complete the way users expect (the width and height of the canvas specfically).

It seems like it&#39;s possible to pass an array as an argument to my command, but I don&#39;t see there being a way to specify the binding to my two canvas properties in the CommandParameter:

    &lt;Button Content=&quot;Zoom&quot; 
            Command=&quot;{Binding MyViewModel.ZoomCommand&quot; 
            CommandParameter=&quot;{Binding ElementName=MyCanvas, Path=Width}&quot;/&gt;

How do I pass both Width and Height to my command?  It doesn&#39;t seem like this is possible using commands from XAML and I need to wire up a click handler in my codebehind to get this information to pass to my zoom method.

Passing two command parameters using a WPF binding

My DLLs are loaded by a third-party application, which we can not customize. My assemblies have to be located in their own folder. I can not put them into GAC (my application has a requirement to be deployed using XCOPY).
When the root DLL tries to load resource or type from another DLL (in the same folder), the loading fails (FileNotFound).
Is it possible to add the folder where my DLLs are located to the assembly search path programmatically (from the root DLL)? I am not allowed to change the configuration files of the application.

How to add folder to assembly search path at runtime in .NET?

I am processing a `TreeView` of directories and files. A user can select either a file or a directory and then do something with it. This requires me to have a method which performs different actions based on the user&#39;s selection.

At the moment I am doing something like this to determine whether the path is a file or a directory:

    bool bIsFile = false;
    bool bIsDirectory = false;
    
    try
    {
        string[] subfolders = Directory.GetDirectories(strFilePath);
    
        bIsDirectory = true;
        bIsFile = false;
    }
    catch(System.IO.IOException)
    {
        bIsFolder = false;
        bIsFile = true;
    }

I cannot help to feel that there is a better way to do this! I was hoping to find a standard .NET method to handle this, but I haven&#39;t been able to do so. Does such a method exist, and if not, what is the most straightforward means to determine whether a path is a file or directory?

Better way to check if a Path is a File or a Directory?

With `/bin/bash`, how would I detect if a user has a specific directory in their $PATH variable?

For example

    if [ -p &quot;$HOME/bin&quot; ]; then
      echo &quot;Your path is missing ~/bin, you might want to add it.&quot;
    else
      echo &quot;Your path is correctly set&quot;
    fi

Detect if PATH has a specific directory entry in it

How do I use a relative path in Xcode project settings?

How do I escape ampersands in a batch file (or from the 
Windows command line) in order to use the `start` command to 
open web pages with ampersands in the URL?

Double quotes will not work with `start`; this starts a new 
command-line window instead.

**Update 1**: Wael Dalloul&#39;s solution works. In addition, if 
there are URL encoded characters (e.g. space is encoded as 
%20) in the URL and *it is in a batch file* then &#39;%&#39; must be 
encoded as &#39;%%&#39;. This is not the case in the example.

Example, from the command line (`CMD.EXE`):

    start http://www.google.com/search?client=opera&amp;rls=en&amp;q=escape+ampersand&amp;sourceid=opera&amp;ie=utf-8&amp;oe=utf-8

will result in 

    http://www.google.com/search?client=opera 

being opened in the default browser and these errors in the command line window:

    &#39;rls&#39; is not recognized as an internal or external command,
    operable program or batch file.
    &#39;q&#39; is not recognized as an internal or external command,
    operable program or batch file.
    &#39;sourceid&#39; is not recognized as an internal or external command,
    operable program or batch file.
    &#39;ie&#39; is not recognized as an internal or external command,
    operable program or batch file.
    &#39;oe&#39; is not recognized as an internal or external command,
    operable program or batch file.


Platform: Windows XP 64 bit SP2.


How do I escape ampersands in batch files?

I have some XML text that I wish to render in an HTML page. This text contains an ampersand, which I want to render in its entity representation: `&amp;amp;`.

How do I escape this ampersand in the source XML? I tried `&amp;amp;`, but this is decoded as the actual ampersand character (`&amp;`), which is [invalid in HTML](https://stackoverflow.com/questions/3493405/do-i-really-need-to-encode-as-amp).

So I want to escape it in such a way that it will be rendered as `&amp;amp;` in the web page that uses the XML output. 

How do I escape ampersands in XML so they are rendered as entities in HTML?

I have the following:

    var text = &quot;&#220;bergro&#223;e &#196;pfel mit W&#252;rmern&quot;;

I&#39;m searching for a Javascript function to transform the text so that every special letter is represented by its HTML entity sequence like this:

    var newText = magicFunction(text);
    ...
    newText = &quot;&amp;Uuml;bergro&amp;szlig;e &amp;Auml;pfel mit W&amp;uuml;rmern&quot;;

The function should **not only** escape the letters of this example [but also all of these.][1]

How would you achieve that? Is there any existing function out there? (Plain, because a solution without a framework is preferred)


Btw: Yes, I&#39;ve seen [this question][2] but it doesn&#39;t address my need.


  [1]: http://www.w3.org/TR/html4/sgml/entities.html
  [2]: https://stackoverflow.com/questions/784586/convert-special-characters-to-html-in-javascript

How to convert characters to HTML entities using plain JavaScript

I have problem with HTTP headers, they&#39;re encoded in ASCII and I want to provided a view for downloading files that names can be non ASCII. 

    response[&#39;Content-Disposition&#39;] = &#39;attachment; filename=&quot;%s&quot;&#39; % (vo.filename.encode(&quot;ASCII&quot;,&quot;replace&quot;), )

I don&#39;t want to use static files serving for same issue with non ASCII file names but in this case there would be a problem with File system and it&#39;s file name encoding. (I don&#39;t know target os.)

I&#39;ve already tried urllib.quote(), but it raises KeyError exception.

Possibly I&#39;m doing something wrong but maybe it&#39;s impossible.

How to encode UTF8 filename for HTTP headers? (Python, Django)

I know some of the escape characters in Java, e.g.

    \n : Newline
    \r : Carriage return
    \t : Tab
    \\ : Backslash
    ...

Is there a complete list somewhere?

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