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• Validate format of email in rails.

  - by piemesons

  validates_format_of :email, :with => /^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)/, :message => "is missing or invalid" Please let me know where is the problem? Is regular expression is wrong?

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• If the n-body problem is chaotic, why isn't it used as a RNG?

  - by David Titarenco

  I'm probably missing something pretty basic here, but if the n-body problem yields chaotic results (except in specific highly-symmetric conditions), couldn't it be used as a "true" random number generator (with initial pseudo-random seeds for masses and velocities) given its non-deterministic nature?

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• linux, LD_PRELOAD error

  - by user286215

  Hello, i am new in programming under linux and trying to get working this code: http://scaryreasoner.wordpress.com/2007/11/17/using-ld_preload-libraries-and-glibc-backtrace-function-for-debugging/ but getting error: "ERROR: ld.so: object 'libwrap_ioctl.so' from LD_PRELOAD cannot be preloaded: ignored." what can cause it? system - Archlinux, kernel 2.6.32 thank you for answers upd1: "Check with ldd libwrap_ioctl.so if some dependency of this library is missing." checked. no, i have all needed libraries

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• GAE: Why are subclasses NOT instances of db.Model (parent)?

  - by bryanallott

  Given: class A: pass class B(A): pass isinstance(B(), A) will return True. BUT class MyModel(db.Model): pass isinstance(MyModel(), db.Model) returns False(surely True?). What am I missing?

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• Moving SWC to libs folder breaks project

  - by asawilliams

  I have a swc(degrafa) that I have been referencing externally in another folder on my computer. When I tried to move the swc to the libs folder I was no longer able to access the swc from my application. Is there a step im missing?

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• Websites that archive browser inconsistency bugs?

  - by meder

  I'm about to develop my own browser inconsistency/bug compendium site but I'm wondering if I really need to - can we get a wiki of sites that do this already? I'm aware of a lot of them but I hope I'm not missing out on some major ones.

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• Regular expression to match non-negative integers in PHP?

  - by kavoir.com

  I seem to get it to work with the following regexp by preg_match(): @^(?:[1-9][0-9]*)|0$@ Yet it's weird that it matches '-0', considering there are no '-' allowed at all in the regexp. Why? What's more weird is that if you switch the parts divided by |: @^0|(?:[1-9][0-9]*)$@ It matches all negative integers such as '-2' and '-10', etc. What am I missing here? Any better regexp for non-negative integer?

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• Can an app read iCal data on the iPHone/Pad in OS 3? OS 4?

  - by Joe Dunn

  Pretty much the title: I'm interested in building an app that displays iCal calendar data. But cant find a direct to to do it. Am I missing something? do the changes in OS 4 make this possible? Thanks.

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• html/css: set div bounding box to window height

  - by noamtm

  It looks like I'm missing something basic. I want a certain DIV to have the height of the window. The effect should be that there's never any need to scroll down. Do I have to use JavaScript? I was told that it's possible with css, but I can't find the relevant property - or I'm doing something wrong.

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• how to run if(!User.IsAuthenticated) or access Profile.values in App_Code? c# .NET

  - by korben

  i'm trying to run a conditional statement in a class i'm placing in my App_Code folder the condition is whether the person is logged in or not. I normally have two ways to do this in my masterpage and ASPX's if (!User.IsAuthenticated) or if(Profile.username = "anonymous") however neither of these things seem available to me in the .cs i'm making. anyone know what i'm missing? maybe a using namespace up top?

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• Which is the fastest idiomatic way to add all vectors (in the math sense) inside a Scala list?

  - by davips

  I have two solutions, but one doesn't compile and the other, I think, could be better: object Foo extends App { val vectors = List(List(1,2,3), List(2,2,3), List(1,2,2)) //just a stupid example //transposing println("vectors = " + vectors.transpose.map (_.sum)) //it prints vectors = List(4, 6, 8) //folding vectors.reduce { case (a, b) => (a zip b) map { case (x, y) => x + y } } //compiler says: missing parameter type for exp. function; arg. types must be fully known }

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• How do I bit shift a long by more than 32 bits?

  - by mach7

  It seems like I should be able to perform bit shift in C/C++ by more than 32 bits provided the left operand of the shift is a long. But this doesn't seem to work, at least with the g++ compiler. Example: unsigned long A = (1L << 37) gives A = 0 which isn't what I want. Am I missing something or is this just not possible? -J

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• What's the big deal with brute force on hashes like MD5

  - by Jan Kuboschek

  I just spent some time reading http://stackoverflow.com/questions/2768248/is-md5-really-that-bad (I highly recommend!). In it, it talks about hash collisions. Maybe I'm missing something here, but can't you just encrypt your password using, say, MD5 and then, say, SHA-1 (or any other, doesn't matter.) Wouldn't this increase the processing power required to brute-force the hash and reduce the possibility of collision?

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• memcache, wamp, php 5.4, win8

  - by user1406269

  I am using wamp, PHP 5.4 running on win 8, I can't seem to get PHP to acknowledge the memcache dll. I download php_memcache-3.0.8-5.4-ts-vc9-x86.zip (the only one I could find). I copied the dll to C:\wamp\bin\php\php5.4.12\ext I added extension=php_memcache.dll restart the server. but still I cannot use memcache, and it is missing from Loaded Extensions list. Please supply a step-by-step instruction on how to set this up, Thanks.

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• Problem with URI matcher in Android.

  - by Lunchbox

  I have an authority string defined as such: public final static String AUTHORITY = "dsndata.sds2mobile.jobprovider"; Followed by an edition to the UriMatcher: uriMatcher.addURI(JobMetaData.AUTHORITY, "/JobNames/*", JOBNAME_SINGLE_URI); The uri that gets passed to the switch is: content://dsndata.sds2mobile.jobprovider/JobNames/test This falls through the switch and hits the default (which throws an IllegalArgumentException). Am I missing something? I've searched and can't find anything that would account for the mismatch.

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• Z-index bug with IE6.. can't seem to figure this one out

  - by Trip

  I am working on this gorgeous header here at : http://kayaskitchenbelmar.com/test/header.html Unfortunately, in IE6, the drop downs that come off of the Print and View buttons collapse on to a new line. This is because of the common z-index bug. I tried resolving this by making the parent div have a higher z-index and position relative with its child a lower z-index and position absolute, but that didn't seem to work. Possibly I'm missing something obvious? Thanks so much

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• RESTful API: How to model 'request new password'?

  - by Jan P.

  I am designing a RESTful API for a booking application and was quite happy to see I could map all details of the application to the 4 HTTP methods. /users - GET, POST /users/({id}|myself) - GET, POST, PUT, DELETE /users/({id}|myself)/bookings - GET, POST /users/({id}|myself)/bookings/{id} - GET, POST, PUT, DELETE Example: Updating my own user uses a PUT to /users/myself. But now I found out that one thing is missing: The possibility to request a new password if I forgot my old one. Any idea how I could add this?

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• Why is this simple hello world PHP code not working?

  - by Silva

  class saySomething { var $helloWorld = 'hello world'; function sayHelloWorld($helloWorld) { echo $helloWorld; } } $saySomething = new saySomething(); $saySomething->sayHelloWorld(); the above gives this error: Warning: Missing argument 1 for saySomething::sayHelloWorld(), called in C:\xampp\htdocs\test.php on line 15 and defined in C:\xampp\htdocs\test.php on line 7

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• Logging data with scribe

  - by lukatmyshu

  None of the scribe examples I've seen actually mention the best way to take logs/logfiles and send them to scribe. I could configure a logrotate script that has a postrotate section that "cats" the rotated file to scribe (but then I get minutes latency at best). The other option is to keep a "tail -f= | my_scribe_sender" and hope that the process never gets killed. However then you really can't guarantee that you're not missing/duplicating data.

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• On linux, how to check if port is in listen state without trying to connect.

  - by Daniel

  Hi, How do I check with C if a port on my local machine (if required by passing an IP or interface, too), is in listen state? I don't want to connect to this port for checking because I don't want to irritate the service behind this port. I want to use this to add the missing net.tcp.listen item to Zabbix.

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• Getting a list of all children of a given commit

  - by intuited

  I'd like to run git filter-branch on all children of a given commit. This doesn't seem to be an easy task, since there doesn't appear to be a way to tell git rev-list to only return children of a particular commit. Using the .. syntax won't work because it will also include the parent commits of any merge within that range. Am I missing something here?

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• Numeric test when using the conditional operator

  - by lupuslupus

  In bash, why doesn't this work: $ echo $((1 -gt 2 ? 3 : 4)) bash: 1 -gt 2 ? 3 : 4: syntax error in expression (error token is "2 ? 3 : 4") Neither does this: $ echo $(((1 -gt 2) ? 3 : 4)) bash: (1 -gt 2) ? 3 : 4: missing `)' (error token is "2) ? 3 : 4")

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• editing swf files in flash

  - by user297627

  after converting my website file from swf to .fla format with the sothink decompiler many of the frames are missing that have text and images in them when i open the converted file in flash cs4..i am using flash and editing website files for the first time a descriptive answer would be appreciated.

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• when i moved from FW3.5 to FW2.0 i got error

  - by Gold

  hi i have buield my project on VS2008 under FrameWork 3.5 now i need to move to FrameWork 2.0 when i done this, i got this error: Error 1 The type or namespace name 'TypedTableBase' does not exist in the namespace 'System.Data' (are you missing an assembly reference?) C:\Documents and Settings\xxx\Desktop\demo2005\demo\MyDB.Designer.cs 391 68 demo in this line: public partial class DO1TblDataTable : global::System.Data.TypedTableBase<DO1TblRow> { i think that it something with the crystal-report thank's in advance

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• Floating point computer - Trouble with getting back correct results

  - by Francisco P.

  Having trouble with a challenge. Let's say I have a theoretical, base 10, floating point calculator with the following characteristics Only 3 digits for mantissa 1 digit for exponent Sign for mantissa and exponent How would this machine compute the following? 300 + \sum_{i=1}^{100} 0.2 The correct result is 320. The machine's result is 300. But why? Can't get where the 20 goes goes missing... Thanks for your time.

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