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• Warning produced by f#: value has been copied to ensure the original is not mutated

  - by user1878761

  The first definition below produces the warning in the title when compiled with f# 3.0 and the warning level set to 5. The second definition compiles cleanly. I wondered if someone could please explain just what the compiler worries I might accidentally mutate, or how would splitting the expression with a let clause help avoid that. Many thanks. let ticks_with_warning () : int64 = System.DateTime.Now.Ticks let ticks_clean () : int64 = let t = System.DateTime.Now t.Ticks

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• Limits GUIs in C#

  - by xarzu

  What are the limits of writing a C# app when you want a truly impressive GUI? At what point does one have to leave Visual C# behind and go into WPF? Also, if I choose to go with WPF, do I have to ditch the Visual Studio IDE and go with Expression Studio?

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• Page width in SSRS

  - by Kramii

  I want ot draw a line the full width of the page in SSRS. If I could get the page width in (say) px, I could assign it as an expression to the line width. Is this possible? How? Or is there an alternative?

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• When is `x IS NOT NULL` not the same as `NOT(x IS NULL)`

  - by Mark Hurd

  For what x is The expression x IS NOT NULL is not equal to NOT(x IS NULL), as is the case in 2VL (quote from this answer, which is quoting Fabian Pascal Practical Issues in Database Management - A Reference for the Thinking Practitioner -- near the end of that answer) My guess is when x IS NULL is NULL, but I cannot guess when that would be (i.e. I haven't checked the SQL standard).

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• Regular expressions - how to match the character '<' not followed by ('a' or 'em' or 'strong')?

  - by Spines

  How would I make a regular expression to match the character '<' not followed by ('a' or 'em' or 'strong') so <hello and <string would match, but <strong wouldn't. UPDATE: Btw, the language I'm using is javascript

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• InfoPath: How to display a third column of a datasource?

  - by Michael Bray

  I have an InfoPath 2007 browser-enabled form that has a datasource with three columns, let's say columns A, B, and C. I have a dropdown that is keyed to column A and displays column B. Column C contains some data that I want to display in an expression box, and that I also want to use in some data validation against another field on the form. I'm looking for some help on how to reference that column C for displaying and use in validation. Thanks!

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• What is wrong with this PHP function.

  - by [email protected]

  I am new to PHP and regular expression. I was going thorugh some online examples and came with this example: <?php echo preg_replace_callback('~-([a-z])~', function ($match) { return strtoupper($match[1]); }, 'hello-world'); // outputs helloWorld ?> in php.net but to my surprise it does not work and keep getting error: PHP Parse error: parse error, unexpected T_FUNCTION Why get error ?

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• vim variable declaration

  - by dorelal

  I added following line of code in .vimrc let g:jslint_status = 'enabled' if exists("jslint_status") echo jstlint_status else echo 'not found' endif Error message E121: Undefined variable: jstlint_status E15: Invalid expression: jstlint_status What am I doing wrong?

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• SSRS - Sort table based on column value

  - by Ehsan

  I am trying to sort the following table: hYear hSale ------------------------------------ [year] =Count(Fields!sale.Value) The table only has one row group (year) and no column group. I'd like to: -initially sort the table based on the calculated value; is it possible? -add interactive sort to calculated column based on the value. I assume I should sort 'Detail rows', but what will be the sort expression?

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• How do I perform multiple replacements with Perl?

  - by duenguyen

  I have Perl code: my $s = "The+quick+brown+fox+jumps+over+the+lazy+dog+that+is+my+dog"; I want to replace every + with space and dog with cat. I have this regular expression: $s =~ s/\+(.*)dog/ ${1}cat/g; But, it only matches the first occurrence of + and last dog.

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• Retrieve all hashtags from a tweet in a PHP function

  - by snorpey

  Hi. I want to retrieve all hashtags from a tweet using a PHP function. I know someone asked a similar question here, but there is no hint how exactly to implement this in PHP. Since I'm not very familiar with regular expressions, don't know how to write a function that returns an array of all hashtags in a tweet. So how do I do this, using the following regular expression: #\S*\w

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• Integer separated by comma

  - by FrenchiInLa

  What's the best regular expression for integer separated by comma? It can also contain space between comma, and the field is not required which means it could be blank. 123,98549 43446 etc..

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• Negative look ahead java

  - by venu

  I need an expression to capture a string like this "A"[A string that is NOT atleast 5 and atmost 6 digits]"B", In other words capture anything that is NOT the following A[0-9][0-9][0-9][0-9][0-9]B A[0-9][0-9][0-9][0-9][0-9][0-9]B I have tried the negative look ahead regex = "a((?![0-9]{5,6}).)*d" ; But it fails to capture all scenarios. Please help venu

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• Change a regexp in application.js from rails

  - by Markus

  I wand to change the regular expression in my application.js file from within a rails controller. Is that possible?

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• Restrict characters used in a string

  - by Jeremy Rudd

  How do I restrict a string to whitelisted characters? // "HOW am I to understand; this is, BAD" $str = restrictTo($str,"0-9a-z,. "); // " am I to understand this is, " Is there an inbuilt function in PHP that does something close? I can't formulate a regular expression for this though :(

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• Reflection problem - Type Safety Warning

  - by jax

  Class<? extends Algorithm> alg = AlgorithmAllFrom9AndLastFrom10Impl.class Constructor<Algorithm> c = alg.getConstructors()[0]; For "alg.getConstructors()[0];" I am getting a warning in eclipse Type safety: The expression of type Constructor needs unchecked conversion to conform to Constructor How do I fix this?

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• Converting upper-case string into title-case using Ruby

  - by wsb3383

  Hi, all. I'm trying to convert an all-uppercase string in Ruby into a lower case one, but with each word's first character being upper case. Example: convert "MY STRING HERE" to "My String Here". I know I can use the .downcase method, but that would make everything lower case ("my string here"). I'm scanning all lines in a file and doing this change, so is there a regular expression I can use through ruby to achieve this? Thanks!

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• Is there a decent technique for SSIS Derived Column date formatting?

  - by theog

  I just had to write the most redonkulous expression in an SSIS Derived Column to get dates formatted like "01-JAN-2010".  It lookes like this:        There's got to be a better way... isn't there?

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• Function of: if(/(file|http).*/.test(url)) { }

  - by WmasterJ

  I am wondering what this technique is called and what it does. It seems to be validating some regular expression on the variable url. I am customizing another persons code: var url = document.getElementById("editorURL").value; if(/(file|http).*/.test(url)) { } Maybe someone has a link to an article that explains this a bit more in-depth?

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• Abstract over X

  - by Bruno Bieth

  Sorry for this english related question but I only came across that expression in the context of IT. What does abstracting over something mean ? For example abstracting over objects or abstracting over classes. Thanks

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• passing Func<TSource, TKey> keySelector error

  - by user338429

  static void Main() { string[] a = { "a", "asd", "bdfsd", "we" }; a = a.OrderBy(fun).ToArray(); } private static int fun(string s) { return s.Length; } its is giving compile time error . I know that we can do this with Lambda expression like this. a.OrderBy(s=>s.Length).ToArray(); but i want to this do by defining different function . What mistake i have done?

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• Haskell Tuple Size Limit

  - by SHiNKiROU

  Why I can't construct large tuples in Haskell? Why there's a tuple size limit? Prelude> (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1) <interactive>:1:0: No instance for (Show (t, t1, t2, ... t23)) arising from a use of `print' at <interactive>:1:0-48 Possible fix: add an instance declaration for (Show (t, t1, t2, ... t23)) In a stmt of a 'do' expression: print it

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• Custom Control in Silverlight ListBox

  - by jaime

  I have a custom control I created from a expression design I created and exported to xaml. I have put in it a bound itemtemplate/datatemplate of a ListBox contorl. It doesn't seem to be rendering more than once and/or it is rendering each item in the same place(kind of like the same x,y coordinates.

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• check that int array contains !=0 value using lambda

  - by netmajor

  hey, I have two-dimension array List<List<int>> boardArray How can I enumerate throw this array to check that it contains other value than 0 ? I think about boardArray.Contains and ForEach ,cause it return bool value but I don't have too much experience with lambda expression :/ Please help :)

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• Linq List contains specific values.

  - by Raffaeu

  I need to know if the List I am working with contains only some specific values. var list = new List<string> { "First", "Second", "Third" }; If I want to know if the List contain at least one item with the value "First" I use the Any keyword: var result = list.Any(l => l == "First"); But how I can write a Linq expression that will return true/false only if the List contains "First" and "Second" values?

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