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  • Regex with all optional parts but at least one required

    - by Alan Mendelevich
    I need to write a regex that matches strings like "abc", "ab", "ac", "bc", "a", "b", "c". Order is important and it shouldn't match multiple appearances of the same part. a?b?c? almost does the trick. Except it matches empty strings too. Is there any way to prevent it from matching empty strings or maybe a different way to write a regex for the task.

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  • alternative ways to display a list

    - by joshua
    Hi everyone, I know on how to display a list by using loop. For example, choice(a):-write('This is the top 15 countries list:'),nl, loop(X). loop(X):-country(X),write(X),nl,fail. Unfortunately,I don't know on how to display list by using list.anyone can guide me?

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  • Can a BufferedImage be written to file any format?

    - by ncoder
    Is it correct that if we have a BufferedImage object in java, we could potentially write it out in ANY format using ImageIO.write (if we have a Writer object for the same)? I tried writing a BufferedImage object into a jpg file, it outputted an empty image file however when i tried writing it in to a png file, it worked fine.

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  • How to check location of 32bit Program FIles folder in windows .bat script

    - by Arek
    I want to write .bat script which works under all flavours of Windows, no matter if 32 or 64 bit. In this script I want to run some file.exe. That file is located in C:\Program Files\ under 32-bit systems or C:\Program FIles (x86)\ under x64 systems. I can write: "%ProgramFiles(x86)%\file.exe" under 64bit systems or "%ProgramFiles%\file.exe" under 32bit systems but I want to make the script universal. Is there any way of determining that path universally?

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  • How much is the database being read from vs written to?

    - by Bill Paetzke
    I'd like to determine if my web app is read-heavy, write-heavy, or somewhere in between. I could take a guess, but I want proof. Is there a query I could run in Sql Server 2005 that would tell me the overall read/write ratio? Are there any caveats I should be aware of? Perhaps it can be found in a DMV query, or the Performance Dashboard, or examining a Sql Profiler trace. I'm not sure exactly how.

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  • Why does this IF statement fail?

    - by ChosenOne
    If variable path is empty, and editor.Text is not empty, the SaveFileDialog should be displayed. Now, why on earth is this damn thing failing??? I have tried this with many different variations of code with the same result: FAIL: if(path.Length >= 1) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } At the top of code file I have: path = String.Empty; So why the heck it this failing every single time, even after trying all of the below variations? if(path.Length > 1) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } and if(String.IsNullOrEmpty(path)) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } and if(String.IsNullOrWhiteSpace(path)) // path contains a path. Save changes instead of creating NEW file. { File.WriteAllText(path, content); } else { // no path defined. Create new file and write to it. using(SaveFileDialog saver = new SaveFileDialog()) { if(saver.ShowDialog() == DialogButtons.OK) { File.WriteAllText(saver.Filename, content); } } } This is making me very angry. How could this fail? Setting a break point reveals that path is definitely null/"".

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  • Oracle: how to use updateXML to update multiple nodes in a document?

    - by Alessandro Vernet
    I can write: update my_table set xml = updateXML(xml, '/a/b', '1') where document_id = 123 Now what if in the same update query I also want to set /a/c to 2 (in addition /a/b to 1)? I am tempted to write: update my_table set xml = updateXML(xml, '/a/b', '1'), xml = updateXML(xml, '/a/c', '2') where document_id = 123 But this give me a "ORA-00957: duplicate column name". Any suggestion on how to do this?

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  • convert sql to linq sample

    - by Jeroen Breuer
    Hello, I've got a sql statement, but I can't get it working in linq. Can someone show me how I can write the following sql statement as linq? SELECT * FROM mobileApplication LEFT JOIN videoMobile ON mobileApplication.id = videoMobile.mobileApplicationId AND videoMobile.videoId = 257 It's a left join with a where statement on the right table. It works in sql server 2005, but I'd like to write it in linq.

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  • Giving background music to a webpage

    - by rag
    var musicsrc="jyothir2.mp3"; if (navigator.appName=="Microsoft Internet Explorer") document.write('<bgsound src='+'"'+musicsrc+'"'+' loop="infinite">') else document.write('<embed src=\"'+musicsrc+'\" hidden="true" border="0" width="20" height="20" autostart="true" loop="infinite">') friends my javascript( for background music) codes is producing a continuous music in IE but the music is not continuous in other browsers.. can anybody tell me why is it so?

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  • Testing SocketChannel NIO

    - by hotzen
    Hello, I just wrote some NIO-code and wonder how to stress-test my implementation regarding SocketChannel.write(ByteBuffer) not able to write the whole byte-buffer SocketChannel.read(ByteBuffer) reading the data in chunks into ByteBuffer are there some simple linux-utilities like telnet to open a ServerSocket with some buffering-options?

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  • Last words of a ??? programmer

    - by Peter
    What will the last words of some kind of programmer be? Like: LW of a Perl programmer: I don't have to write documentation. The source is formatted so well, I can read it anytime later... or Im just going to write a regular expression to find this, then I'm done...

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  • Check if BigInteger is not a perfect square

    - by Ender
    I have a BigInteger value, let's say it is 282 and is inside the variable x. I now want to write a while loop that states: while b2 isn't a perfect square: a ? a + 1 b2 ? a*a - N endwhile How would I do such a thing using BigInteger? EDIT: The purpose for this is so I can write this method. As the article states one must check if b2 is not square.

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  • Can I ensure all tests contain an assertion in test/unit?

    - by Andrew Grimm
    With test/unit, and minitest, is it possible to fail any test that doesn't contain an assertion, or would monkey-patching be required (for example, checking if the assertion count increased after each test was executed)? Background: I shouldn't write unit tests without assertions - at a minimum, I should use assert_nothing_raised if I'm smoke testing to indicate that I'm smoke testing. Usually I write tests that fail first, but I'm writing some regression tests. Alternatively, I could supply an incorrect expected value to see if the test is comparing the expected and actual value.

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  • PHP file_exists and wildcard

    - by paracaudex
    Is there a way to write the PHP file_exists function so that it searches a directory for a file with an arbitrary extension. For instance, suppose I knew that a file were called "hello", but I didn't know the extension, how would I write a function that searched for a file called hello.* and returned the name of this file? As far as I can tell, file_exists will only search for a string. Thanks.

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  • First steps in Spring Framework

    - by theband
    I have downloaded Spring Framework and using SpringSource dm Server. I just need to write a simple Hello world using Spring Framework. I don't know about the configuration and where to write the JAVA code. I did a google, but could not find anything that can help me out.

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  • Redis - Records Fall Off

    - by Ian
    With memcache, when you exceed the available ram, it automatically drops the oldest records off the end of the stack.. Is there a way to do this with redis? I'm trying to find ways to avoid running in to a write error (when there's no more available ram), other than setting a timeout. The only reason the timeout isn't useful, it because it doesn't guaranty the ability to write.

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  • validation on telephone numbers?

    - by Surya sasidhar
    hi, in my application i want to validate the telephone numbers, how can i write regular expression for telephone numbers like.. 040-23357399 or 04023357399 91-40-23357399 or 914023357399 08518-2814655 or 085182814655 91-8518-2814655 or 9185182814655 this is my phone numbers how can i write the expression for this

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  • Is there way to extend jQuery to handle a custom enter key event?

    - by Ken
    I write the following code all the time to handle when the enter key pressed: $("#selectorid").keypress(function (e) { if (e.keyCode == 13) { var targetType = e.originalTarget ? e.originalTarget.type.toLowerCase() : e.srcElement.tagName.toLowerCase(); if (targetType != "textarea") { e.preventDefault(); e.stopPropagation(); // code to handler enter key pressed } } }); Is there a way to extend jQuery so that I could just write: $("#selectorid").enterKeyPress(fn);

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  • how to create a dynamic sql statement w/ python and mysqldb

    - by Elias Bachaalany
    I have the following code: def sql_exec(self, sql_stmt, args = tuple()): """ Executes an SQL statement and returns a cursor. An SQL exception might be raised on error @return: SQL cursor object """ cursor = self.conn.cursor() if self.__debug_sql: try: print "sql_exec: " % (sql_stmt % args) except: print "sql_exec: " % sql_stmt cursor.execute(sql_stmt, args) return cursor def test(self, limit = 0): result = sql_exec(""" SELECT * FROM table """ + ("LIMIT %s" if limit else ""), (limit, )) while True: row = result.fetchone() if not row: break print row result.close() How can I nicely write test() so it works with or without 'limit' without having to write two queries?

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  • Encoding MP3 and adding VBR or Xing headers (with lame or another method)

    - by J. Pablo Fernández
    I'm writing a program that converts wavs to mp3s, so far, by using lame. It's generating a command line more or less like this: "c:\Program Files (x86)\Lame for Audacity\lame.exe" --preset fast medium in.wav out.mp3 The problem I'm having is that no VBR or Xing headers are written to the MP3. How can I make lame.exe write those headers? Should I use another program to write those headers (platform is Windows, .Net 3.5)? Should I use another program for MP3 encoding?

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  • Japanese fonts in a Java GUI

    - by kakashi
    Hi everyone, Is it possible to write a GUI in Java that would display Japanese fonts correctly regardless of the language settings of the OS it's being run on? I'd like to write a program which is able to do this but I'm not sure how to start going about this. Any advice would be a huge help!

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