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Rextester - some online tools for anyone who finds them useful. It was started as online .net regex tester.
Short faq and troubleshooting.
Discussion forum.



Regex tester - .net regex tester.
Regex replace - .net regex replacement.
Regex reference - short regex reference.
Diff checker - find difference between two text fragments.
Run code - online compiling and execution for some languages.

C#, Visual basic, F#
.Net framework v. 4.5 is used. Your code will be given max 5 sec of cpu time and limited memory (~150 Mb). Also your code will run in an appdomain with basic execution, reflection, thread control and web privileges only.
The entry point for your code is given Main method in type Program in namespace Rextester. This entry point shouldn't be changed. Types from following assemblies are available: For F# additional assemblies are included: If you found security breaches and can break something in some way - we would appreciate your feedback on this.
Compiler versions:
Sql Server
Sql Server 2012 Express Edition is used. There is only one database that queries run against. Queries executed on behalf database owner so all sort of actions are allowed including DDL queries. However, all actions run in transaction which is rolled back immediately after execution is over. This way any desired objects may be built, populated with data and worked on within the scope of one request. There is 10 seconds limit for work to be completed. Execution of queries is achieved using ado.net mechanisms, in particular SqlDataReader type. This reader is also monitored for memory and cpu consumption.
'GO' statement just like in transact sql has special meaning: 'GO' will be removed from your code, but statements separated by 'GO' will be executed separately, in different batches. So, for example, if you want to create a function and later use it in select statement you have to separate create statement and select statement by 'GO', otherwise you'll receive an error from parser since in select statement you would be reffering to a function which doesn't yet exist.
For convinience there is simple pre-built schema, shown here.

Visual C++ (and C)
Your code is compiled to native binary which runs on Windows Server 2012 (maximum compile time is 30 seconds). Your process will be associated with job object that has LimitFlags.JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE flag set. After 10 seconds of execution this process will be killed. This and the fact that your code will be executed on behalf of IIS application pool identity are the only security measures taken. Think you can break the service? Probably so and we'd like to hear how would you do this. Also let us know if you need some other Windows-based compilers.
Compiler version:
Java, Python, C, C++ and others
These languages run on linux. For some languages compiler parameters could be supplied. Here are compiler versions (you can always check by running commands on a server): Your code will be run on behalf special user and group. Also your code will be executed from Python wrapper which sets various limits to the process. It does so by using 'setrlimit' system call. You'll have max 30 sec to compile, max 5 sec of cpu time to run, limited memory (~1500 Mb) and other restrictions will apply (like no writing permissions). Also your process and all its children will be run in a newly created process group which will be terminated after 10 seconds from start if still running.

We don't claim that this is secure. In many senses you'll have the power of special user. On a bright side, this has some useful side-effects. The reason why, at least for now, we leave so many potential security breaches is because it's hard to make it really secure. What are the options? So, if you can take the system down - then be it, but please report how you did this. Your advice on this topic is always welcome.

Input support
Everything that will be submitted as input will be piped to process via stdin stream. So your code should consume input as if it came from keyboard.

Live collaboration
Write code so that others see this real-time. Every participant can make changes and see changes made by others. We use Firepad and Firebase.

Credit
Special thanks goes to people behind CodeMirror, Edit area, Roslyn, MarkdownDeep, Firepad (and Firebase) and Coderev.

Code wall
Code wall as well as personal code walls - place code on a wall for public display. These entries will be crawled by search engines, so one possible use is to put there scripts that you may need for easy access later. For example, whenever I need a sql script for searching database definitions I simply search for 'sql definition rextester' and there is my script (it seems that code wall is crawled better than personal walls, though). It's important that code snippet have a meaningful title.

Feedback - give us feedback. We have implemented a lot of requests so far.
Login - once logged in you'll be able to track your saved snippets and more.


Stats (since 2013-08-15)
Language     Runs    
C# 112050
Java 68767
C++ (gcc) 46937
C (gcc) 16646
Python 13762
C++ (vc++) 11717
C++ (clang) 11413
Sql Server 10366
Python 3 6578
Php 4665
Objective-C 4608
Javascript 4546
Haskell 1834
C (clang) 1827
C (vc) 1759
Visual Basic 1571
Lua 1546
Perl 1344
Octave 1248
Pascal 1206
Ruby 1148
Prolog 1109
F# 827
Scheme 688
Node.js 471
Assembly 342
Scala 317
Go 205
Common Lisp 165
D 16

Api
Restfull api is supported (both POST and GET) at http://rextester.com/rundotnet/api. What needs to be supplied are these values:
    LanguageChoiceWrapper=Language number (see below)
    Program=Code to run
    Input=Input to be supplied to stdin of a process
    CompilerArgs=compiler args as one string (when applicable)
Returned is json string with the following properties:
    Result=Output of a program (in case of Sql Server - html)
    Warnings=Warnings, if any, as one string
    Errors=Errors, if any, as one string
    Stats=Execution stats as one string
    Files=In case of Octave - list of png images encoded as base64 strings
Language numbers:
    C# = 1
    VB.NET = 2
    F# = 3
    Java = 4
    Python = 5
    C (gcc) = 6
    C++ (gcc) = 7
    Php = 8
    Pascal = 9
    Objective-C = 10
    Haskell = 11
    Ruby = 12
    Perl = 13
    Lua = 14
    Nasm = 15
    Sql Server = 16
    Javascript = 17
    Lisp = 18
    Prolog = 19
    Go = 20
    Scala = 21
    Scheme = 22
    Node.js = 23
    Python 3 = 24
    Octave = 25
    C (clang) = 26
    C++ (clang) = 27    
    C++ (vc++) = 28
    C (vc) = 29
    D = 30

Api stats:
Language     Runs    
Python 1781
Php 1477
Ruby 1005
Perl 927
Python 3 605
Lua 362
C# 166
C++ (vc++) 112
Java 79
C (gcc) 58
Pascal 56
C++ (gcc) 44
Javascript 35
Sql Server 1
C++ (clang) 1