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• What is corresponding Cron expression to fire in every X seconds, where X > 60?

  - by giolekva

  I want my jobs to execute in every X seconds, there's one to one matching between job and X. Also during runtime there can be registered new jobs with their own intervals. I've tried to write cron expression for such scenarios, but in documentation there's written that value of seconds can't be more than 69. So cron expression like this: "0/63 * * * * ?" isn't valid. At first sight solution of that problem seemed to be expression like this: "0/3 0/1 * * * ?", but it means completely different thing: trigger job in every three second of every minute. Can you suggest what is the right solution (cron expression) for that? I know I could use just simple timers, but I've to use cron jobs using Quartz.

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• How can I parse free text (Twitter tweets) against a large database of values?

  - by user136416

  Hi there Suppose I have a database containing 500,000 records, each representing, say, an animal. What would be the best approach for parsing 140 character tweets to identify matching records by animal name? For instance, in this string... "I went down to the woods to day and couldn't believe my eyes: I saw a bear having a picnic with a squirrel." ... I would like to flag up the words "bear" and "squirrel", as they appear in my database. This strikes me as a problem that has probably been solved many times, but from where I'm sitting it looks prohibitively intensive - iterating over every db record checking for a match in the string is surely a crazy way to do it. Can anyone with a comp sci degree put me out of my misery? I'm working in C# if that makes any difference. Cheers!

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• Getting req.params in order in Express JS

  - by Adam Terlson

  In Express, is there a way to get the arguments passed from the matching route in the order they are defined in the route? I want to be able to apply all the params from the route to another function. The catch is that those parameters are not known up front, so I cannot refer to each parameter by name explicitly. app.get(':first/:second/:third', function (req) { output.apply(this, req.mysteryOrderedArrayOfParams); // Does this exist? }); function output() { for(var i = 0; i < arguments.length; i++) { console.log(arguments[i]); } } Call on GET: "/foo/bar/baz" Desired Output (in this order): foo bar baz

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• Only strip commas surrounded by numbers in a string

  - by overlook77

  I am using StreamReader to read each line of a CSV file into a string. As I am processing each line, I need to strip out any commas that ONLY are surrounded by other numbers. For example, if the string was: "textfield1", "textfield2", "100.00", "1,070.00" I would need to only take the comma out of "1,070.00" from this entire string, resulting in: "textfield1", "textfield2", "100.00", "1070.00" Each string read from the CSV file can differ in number of fields, length, etc., so I need to use something (Regular Expressions maybe?) that looks at the entire string without hardcoding a location or blanket removal of all commas. Here is the approach I have been trying: StreamReader sr = new StreamReader(strInputFile); string nextLine = sr.ReadLine(); try { while ((nextLine = sr.ReadLine()) != null) { string rawtext = nextLine.Replace("[0-9]"+","+"[0-9]" , "[0-9]"+"[0-9]"); // ....rest of code } } This obviously doesn't work because I don't understand how to do this :) I am new at C# and inexperienced in Regex, so hopefully this is relatively simple.

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• How to remove [^a-z\s] in C++

  - by Steven

  So far I have: int SimplifyText(char chars[], int length) { //To lower for(int i=0; i<length; i++) { chars[i] = tolower(chars[i]); } This function simplifies the text in the first argument which is an array containing the number of characters as given in the second argument The requirements are: tolower all remove all non-alpha characters replace multiple whitespace by one blank. Any leading whitespace at the beginning of the array should be removed completely. The resulting number of characters should be returned as the value of the function. And the annoying part: Another array cannot appear in the function Cannot use strings, only char arrays. Cannot using G++'s extension for setting an array size using a variable. Oh and can't use regex :) I'm stuck with this, any help would be great. :)

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• Removing “duplicate objects” with same attributes using Array.map

  - by keruilin

  As you can see in the current code below, I am finding the duplicate based on the attribute recordable_id. What I need to do is find the duplicate based on four matching attributes: user_id, recordable_type, hero_type, recordable_id. How must I modify the code? heroes = User.heroes for hero in heroes hero_statuses = hero.hero_statuses seen = [] hero_statuses.sort! {|a,b| a.created_at <=> b.created_at } # sort by created_at hero_statuses.each do |hero_status| if seen.map(&:recordable_id).include? hero_status.recordable_id # check if the id has been seen already hero_status.revoke else seen << hero_status # if not, add it to the seen array end end end

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• how to convert seconds to time format?

  - by Dewan159

  hi there for some reason i convert a time format like : 03:30 to seconds 3*3600 + 30*60 , now .. i wanna convert it back to it's first ( same ) format upthere ... how could that be ? My attempt : 3*3600 + 30*60 = 12600 12600 / 60 = 210 / 60 = 3.5 , floor(3.5) = 3 = hour now .. what about the minutes ?? considering the value can be like 19:00 or 02:51 ... i think you got the picture and by the way, how to convert 2:0 for example to 02:00 using RegEx ? Thanks in advance

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• Compiler error when using abstract types

  - by Dylan

  I'm trying to implement a "protocol helper" trait that is responsible for matching up Prompts and Responses. The eventual goal is to have an object that defines the various Prompt and Response classes as subclasses of a sealed trait, then have a class that mixes in the ProtocolSupport trait for that Protocol object. The problem is that my current approach won't compile, even though I'm fairly sure it should. Here's a distilled version of what I've got: trait Protocol { type Response type Prompt <: BasePrompt trait BasePrompt { type Data def validate(response: Response): Validated[Data] } } trait ProtocolSupport[P <: Protocol] { def foo(prompt: P#Prompt, response: P#Response) = { // compiler error prompt.validate(response) } } The compiler doesn't like the response as an argument to prompt.validate: [error] found : response.type (with underlying type P#Response) [error] required: _4.Response where val _4: P [error] prompt.validate(response) [error] ^ This isn't very helpful.. it seems to say that it wants a P.Response but that's exactly what I'm giving it, so what's the problem?

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• boost test case for function taking user input

  - by oadams

  I have a function that takes in user input via std::cin: std::getline(std::cin, in); and creates a corresponding data structure by matching it with a regular expression. The function then returns this data structure. I'm using boost.test and I want to create a unit test to check that the output data type is correct given some inputs. However I don't know how to go about it since the input isn't passed as an argument to the function. EDIT: Is there a simple way to create a boost test case that feeds the function a string via standard input?

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• scala: how to rewrite this function using for comprehension

  - by opensas

  I have this piece of code with a couple of nasty nested checks... I'm pretty sure it can be rewritten with a nice for comprehension, but I'm a bit confused about how to mix the pattern matching stuff // first tries to find the token in a header: "authorization: ideas_token=xxxxx" // then tries to find the token in the querystring: "ideas_token=xxxxx" private def applicationTokenFromRequest(request: Request[AnyContent]): Option[String] = { val fromHeaders: Option[String] = request.headers.get("authorization") val tokenRegExp = """^\s*ideas_token\s*=\s*(\w+)\s*$""".r val tokenFromHeader: Option[String] = { if (fromHeaders.isDefined) { val header = fromHeaders.get if (tokenRegExp.pattern.matcher(header).matches) { val tokenRegExp(extracted) = header Some(extracted) } else { None } } else { None } } // try to find it in the queryString tokenFromHeader.orElse { request.queryString.get("ideas_token") } } any hint you can give me?

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• Access violation C++ (Deleting items in a vector)

  - by Gio Borje

  I'm trying to remove non-matching results from a memory scanner I'm writing in C++ as practice. When the memory is initially scanned, all results are stored into the _results vector. Later, the _results are scanned again and should erase items that no longer match. The error: Unhandled exception at 0x004016f4 in .exe: 0xC0000005: Access violation reading location 0x0090c000. // Receives data DWORD buffer; for (vector<memblock>::iterator it = MemoryScanner::_results.begin(); it != MemoryScanner::_results.end(); ++it) { // Reads data from an area of memory into buffer ReadProcessMemory(MemoryScanner::_hProc, (LPVOID)(*it).address, &buffer, sizeof(buffer), NULL); if (value != buffer) { MemoryScanner::_results.erase(it); // where the program breaks } }

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• Will Haskell be a good choice for my task?

  - by Narzanka

  I'm starting a new project and don't know which language to use. My 'must have' requirements are: Be able to run on Windows/LinuxMacOs natively (native executable) - user should be able to just run the exe (when on Windows for example) and see the results. No runtimes/interpreters (no jvm, clr, etc) - one file download should be enough to run the application. Full unicode support. Be able to manipulate OS threads (create them, run multiple tasks in parallel on multi-core CPUs, etc). Be reasonably fast (Python level performance and better). To have some kind of standard library that does low-level, mundane tasks. Not very niche and have some community behind it to be able to ask questions. My 'nice to have' requirements are: Language should be functional It should have good string manipulation capabilities (not necessarily regex) Not extremely hard to learn I'm thinking about Haskell now but keeping in mind OCaml as well. Please advice if my choice is correct.

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• PHP Case Insensitive Word Replacement

  - by zuk1

  Ok I'm trying to make search terms bold in this search script I'm making, except I can't get it to work case insensitive. function highlight($term,$target){ $terms = explode(" ", $term); foreach($terms as $term){ $result = (eregi_replace($term, "<strong>$term</strong>", $target)); } return $result; } That is the function I have so far.. It says on PHP.net that eregi_replace is case insensitive matching but it's obviously not working for some reason. (I'm a noob). Any ideas? :D

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• Combining IN and NOT IN in SQL as single result

  - by UltraVi01

  I apologize for the vague title. I am attempting to write a query that returns an alias column with matching values (resulting from an IN) as well as an alias column with values that do not match (using NOT IN). I want the result set to have: userId | matches | nonmatches. I currently have the following query which returns the matches as expected. I am having trouble getting the nonmatches in the result set -- that is, from a NOT IN statement SET @userId = 9; SELECT ug.user_id, COUNT(DISTINCT goal_id) as matches FROM user_goal ug WHERE ug.user_id!=@userId AND goal_id IN (SELECT iug.goal_id FROM user_goal iug WHERE user_id=@userId) GROUP BY user_id ORDER BY matches DESC LIMIT 4 So, the NOT IN would look something like this: goal_id NOT IN(SELECT uggg.goal_id FROM user_goal uggg WHERE user_id=@userId) AS nonmatches I am just not sure how to incorporate the NOT IN statement in my query so I get all the results

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• Visual Website Optimizer and Code Igniter

  - by absentx

  We are trying to integrate visual website optimizer into a site of ours that uses Code Igniter. The problem is when we go into the VWO control panel to look at stats and previews nothing seems to be working. In the previews panel, all of them come up as code igniter error pages that say "The URI you submitted has disallowed characters." I have researched some solutions to this and have tried changing the regex in system/config to allow more characters, all characters etc and I am still having the problem. Any known issues or problems trying to integrate VWO and Code Igniter? This definitely seems to be a url issue but I can't nail it down.

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• JavaScript question related to the use of ' and "

  - by vatismarty

  my_window.document.write(' <script type="text/javascript"> function redirect(linkid) { opener.location.href=linkid; window.close(); } </script> <h1>Hello</h1> <p>Thank you.If you accidentally closed our website click <a href="javascript:redirect('http://google.com')">here</font></a> to go back to our website</p> '); This is my piece of code to close a already opened pop up window by redirecting it to google.com. I think there is some problem with matching the apostrophes ' and "... how to code with (' (" (' ') ") ')... is this correct? please help me with this. Please help me with the necessary changes wherever required.

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• How does OfType<T>() Work?

  - by TheCloudlessSky

  How does OfType() Work? I read this link about what's going on but how exactly does the LINQ provider know how to get all objects matching the specified type. I know the IQueryable<T> "chains" up requests and then evaluates when GetEnumerator() is called (right?). Specifically I want to know how does the framework quickly do type comparison? I wrote a method in a .NET 2.0 project that went like this (since 2.0 doesn't support these kind of features): public IEnumerable<TResult> OfType<TResult>() where TResult : class { foreach (TItem item in this.InnerList) { TResult matchItem = item as TResult; if (matchItem != null) { yield return matchItem; } } } Is this the best implementation?

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• Birthday effect - clarification needed plz.

  - by Mark

  Please help interpret the Birthday effect as described in Wikipedia: A birthday attack works as follows: 1) Pick any message m and compute h(m). 2) Update list L. Check if h(m) is in the list L. 3) if (h(m),m) is already in L, a colliding message pair has been found. else save the pair (h(m),m) in the list L and go back to step 1. From the birthday paradox we know that we can expect to find a matching entry, after performing about 2^(n/2) hash evaluations. Does the above mean 2^(n/2) iterations through the above entire loop (i.e. 2^(n/2) returns to step 1), OR does it mean 2^(n/2) comparisons to individual items already in L.

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• Image is not detected if taken from camera Using UIImagePickerControllerSourceTypeCamera

  - by user1314379

  I am trying to build an app which will compare the two images and gives the Matching Percentage. I am taking two Images from The camera(Making use of UIImagePickerController) and saving it to the document directory.Then i fetch these images in a different view controller to get the face part, using CIDetector API and CIfacefeature API. The problem is It is not detecting the face at all through i am able to fetch the images properly. And if i store the same image in the main bundle it detects. I dnt know where the problem is. I have tried everything. May Be the problem is with the UIImage or may be the format in which image is getting saved in document directory or with the camera. Please help. I will be grateful to you. Thanks in Advance.

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• How do I transform a single colmn list to item matrix in R?

  - by Indy

  I currently have data that is in the following format (note, this is 1 column, 4 row matrix): aa|bb bb|cc|ee|ee cc cc|ee and I want it displayed so that the column names are: aa, bb, cc, dd, and ee. And I want there to be 4 row such that each row counts the number of times each string was present in the matching row above. ie) aa bb cc dd ee 1 1 0 0 0 0 1 1 0 2 0 0 1 0 0 0 0 1 0 1 Does anyone know how to do this in R? I would post my attempt, but it is just getting ugly and complicated. Any help would be much appreciated. Thanks in advance.

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• How to specify "PG-USERNAME" in pg_ident.conf so that it'll match any database user ?

  - by felace

  I need to restrict a specific unix user so that it can login with only a few select postgres usernames (with password prompt), but allowing every other user to use whatever pg username they want. Assuming restrUnixUser is the unix user name and restrUser is one of the postgres users it may use, and AllowedDB is the only database they should connect to : pg_hba.conf : local AllowedDB restrUser password local all restrUser reject local all all ident map=exceptrestrUser And pg_ident.conf : exceptrestrUser /^(?!restrUnixUser).*$ user1 exceptrestrUser /^(?!restrUnixUser).*$ user2 exceptrestrUser /^(?!restrUnixUser).*$ postgres does what I exactly want to do right now, however, I'll probably add a lot more users so I wonder if there is something like mapname unixuserpattern allpgusers that'll match with whatever username used to login by any unix user matching the pattern.

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• Get ffmpeg information in friendly way

  - by JBernardo

  Every time I try to get some information about my video files with ffmpeg, it pukes a lot of useless information mixed with good things. I'm using ffmpeg -i name_of_the_video.mpg. There are any possibilities to get that in a friendly way? I mean JSON would be great (and even ugly XML is fine). By now, I made my application parse the data with regex but there are lots of nasty corners that appear on some specific video files. I fixed all that I encountered, but there may be more. I wanted something like: { "Stream 0": { "type": "Video", "codec": "h264", "resolution": "720x480" }, "Stream 1": { "type": "Audio", "bitrate": "128 kbps", "channels": 2 } }

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• Save response from certain WEB resources while recording scenario

  - by jdevelop

  I need to create scenario for user interaction with single-page WEB application. The application does lots of AJAX calls in order to authenticate user and get user data. So I created simple scenario with HTTP Test Script Recorder and tried to record my script. Everything went well, however I noticed that whilst request data is recorder properly, the response data is not recorder at all. I tried to enable Add assertions and Regex matching - but that didn't work as well. Can you please advice how do I record response texts as well?

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• Possible to use Javascript to access the client side's network(knowingly)

  - by Earlz

  I recently found an exploit in my router to basically give me root access. The catch? There is a nonce hidden form value that is randomly generated and must be sent in for it to work that makes it difficult to do "easily" So basically I'm wanting to do something like this in javascript: get http://192.168.1.254/blah use a regex or similar to extract the nonce value put the nonce value into a hidden field in the current page submit the form by POST to http://192.168.1.254/blah complete with the nonce value and other form values I want to send in. Is this at all possible using only HTML and Javascript? I'm open to things like "must save HTML file locally and then open", which I'm thinking is one way around the cross domain policy. But anyway, is this at all possible? I'm hoping for this to be able to run from at least Firefox and Chrome. The audience for this is those with some technical know how.

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• Prevent "jQuery( html )" from triggering the browser to request images and other referenced content

  - by Chris Dutrow

  Using jQuery to create new DOM elements from text. Example: jQuery('<div><img src="/some_image.gif"></img></div>'); When this statement is executed, it causes the browser to request the file 'some_img.gif' from the server. Is there a way to execute this statement so that the resulting jQuery object can be used from DOM traversal, but not actually cause the browser to hit the server with requests for images and other referenced content? Example: var jquery_elememnts = jQuery('<div><img class="a_class" src="/some_image.gif"></img></div>'); var img_class = jquery_elememnts.find('img').attr('class'); The only idea I have now is to use regex to remove all of the 'src' tags from image elements and other things that will trigger the browser requests before using jQuery to evaluate the HTML. How can jQuery be used to evaluate HTML without triggering the browser to make requests to the server for referenced content inside the evaluated HTML? Thanks!

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