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• How can I replace a plus sign in JavaScript?

  - by William Calleja

  I need to make a replace of a plus sign in a javascript string. there might be multiple occurrence of the plus sign so I did this up until now: myString= myString.replace(/+/g, "");# This is however breaking up my javascript and causing glitches. How do you escape a '+' sign in a regular expression?

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• How to match a fixed number of digits with regex in PHP?

  - by user198729

  I want to retrieve the consecutive 8 digits out of a string. "hello world,12345678anything else" should return 12345678 as result(the space in between is optional). But this should not return anything: "hello world,123456789anything else" Because it has 9 digits,I only need 8 digits unit.

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• Unintentional concatenation in Bison/Yacc grammar.

  - by troutwine

  I am experimenting with lex and yacc and have run into a strange issue, but I think it would be best to show you my code before detailing the issue. This is my lexer: %{ #include <stdlib.h> #include <string.h> #include "y.tab.h" void yyerror(char *); %} %% [a-zA-Z]+ { yylval.strV = yytext; return ID; } [0-9]+ { yylval.intV = atoi(yytext); return INTEGER; } [\n] { return *yytext; } [ \t] ; . yyerror("invalid character"); %% int yywrap(void) { return 1; } This is my parser: %{ #include <stdio.h> int yydebug=1; void prompt(); void yyerror(char *); int yylex(void); %} %union { int intV; char *strV; } %token INTEGER ID %% program: program statement EOF { prompt(); } | program EOF { prompt(); } | { prompt(); } ; args: /* empty */ | args ID { printf(":%s ", $<strV>2); } ; statement: ID args { printf("%s", $<strV>1); } | INTEGER { printf("%d", $<intV>1); } ; EOF: '\n' %% void yyerror(char *s) { fprintf(stderr, "%s\n", s); } void prompt() { printf("> "); } int main(void) { yyparse(); return 0; } A very simple language, consisting of no more than strings and integer and a basic REPL. Now, you'll note in the parser that args are output with a leading colon, the intention being that, when combined with the first pattern of the rule of the statement the interaction with the REPL would look something like this: > aaa aa a :aa :a aaa> However, the interaction is this: > aaa aa a :aa :a aaa aa aa > Why does the token ID in the following rule statement: ID args { printf("%s", $<strV>1); } | INTEGER { printf("%d", $<intV>1); } ; have the semantic value of the total input string, newline included? How can my grammar be reworked so that the interaction I intended?

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• mysql datetime performance

  - by praksant

  Hi, since in mysql datetime field is represented as string (i'm not sure how it works internally), wouldn't be from performance point of view faster to store date as unix timestamp? I don't need to use any mysql native date functions, i'm going for performance of sorting and selecting data. if there was an index for that column, would be difference between int and datetime? Thank you

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• Save a <canvas> as a file in a form

  - by Pierre

  Using Canvas method toDataURL, I would like to be able to save the image on the server side (using Rails). With toDataURL string, how to use it in a form that can be seen as a file attachment in a HTML form ?

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• Set title of SplitViewController

  - by John

  I am using the SplitViewController template. How do I set the title on the topbar in the detailview? Been trying to work this out for hours. Tried simple: detailViewController.title = @"String"; but no luck. Any help appreciated. Thanks.

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• How do I avoid web method parameters using proxy classes?

  - by Alex Angas

  I have a serializable POCO called DataUnification.ClientData.ClientInfo in a .NET class library project A. It's used in a parameter for a web service defined in project B: public XmlDocument CreateNewClient(ClientInfo ci, string system) I now wish to call this web method from project C and use the original DataUnification.ClientData.ClientInfo type in the parameter. However due to the generated proxy class it has now become a different type: WebServices.ClientDataUnification.DataUnificationWebService.ClientInfo. As far as .NET is concerned these are not the same types. How can I get around this?

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• Using grails service in domain class

  - by BlackPanther

  In my grails application I want use service.However it is always coming as null.I am using grails 1.1 version.How to solve this problem. Sample code: class A{ String name; def testService; static transients=['testService'] } Can we use service inside domain class?

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• Python Fabric: How to handle arbitrary remote shell prompt for input?

  - by Jay

  This is related to this question here, but with a slight twist: instead of just passing 'yes' or 'no', I need Fabric to pass an arbitrary string to the remote shell. For instance, if the remote shell prompts for 'what is your name?' then I need to feed it 'first,last'

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• Dottrace Dead vs. Garbage

  - by Moshe

  After reading the dottrace documentation I realized that: Dead objects are objects deleted before the end point of the snapshot. Garbage objects are objects allocated after the starting point and deleted before the end point - in other words, "Garbage objects" is a subset of "Dead objects". But after doing some profiling sessions, I could see that sometimes the number of "Garbage objects" is by far greater than the number of "Dead objects" of the same class (for example System.String). How should I interpret this phenomenon?

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• how to encode a datetime in a QueryString and read it in the asp:QueryStringParameter

  - by DavRob60

  How to encode a datetime in a QueryString and read it in the asp:QueryStringParameter out: (it's a asp:HyperLink NavigateUrl ) String.Format("~/Reports/Logs/Option_History.aspx?OptionID={0}&time={1}", id, time) in: <asp:QueryStringParameter Name="time" QueryStringField="Time" Type="DateTime" ConvertEmptyStringToNull="true" />

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• How do I find multiple matches with one regular expression?

  - by christian studer

  I've got the following string: response: id="1" message="whatever" attribute="none" world="hello" The order of the attributes is random. There might be any number of other attributes. Is there a way to get the id, message and world attribute in one regular expression instead of applying the following three one after another? / message="(.*?)"/ / world="(.*?)"/ / id="(.*?)"/

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• How efficient is PHP's substr?

  - by zildjohn01

  I'm writing a parser in PHP which must be able to handle large in-memory strings, so this is a somewhat important issue. (ie, please don't "premature optimize" flame me, please) How does the substr function work? Does it make a second copy of the string data in memory, or does it reference the original? Should I worry about calling, for example, $str = substr($str, 1); in a loop?

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• Entity Framework 4 How to find the primary key?

  - by runxc1 Bret Ferrier

  I am trying to create a generic method using EF4 to find the primary key of an object. example public string GetPrimaryKey() { .... }

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• How to explain method calls?

  - by forki23

  Hi, let's consider a small method: int MyFunction(string foo, int bar) { ... } and some calls: MyFunction("",0) int x = MyFunction(foo1,bar1) How would you explain this to a non-technical persons? Has anybody a nice metaphor? I tried to explain method calling (or function application) several times, but I failed. Seems I can't find the right words here. Regards, forki

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• Best practice to handle non-english characters in Ruby?

  - by ragnarius

  My program file is encoded in UTF-8 so "abc".length == 3 but "åäö".length == 6. I realize that å, ä, ö, etc. are stored as two bytes in UTF-8, and that a Ruby String is a sequence of bytes (not characters), but it is annoying! Is there a best practice to work around this problem?

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• return type of main in java

  - by girinie

  Hi I like to know why only void return type for main method in java. public static void main(String [] args) Why there is no other return types other than void for main method. Thanks

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• Setting a null value in JSF

  - by DD

  I'm trying to set a property to null in JSF but it is interpretting null as a String. Is there a way to do this:

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• Given the full path to a file, how do I get just the path without the filename?

  - by Zerobu

  Hello, Suppose I have a path in a string called '/home/user/directory/HelloWorld.txt'. I would like to remove the HelloWorld.txt, and end up with '/home/user/directory'. What regex would I need.

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• What is your best example of a violation of the Single Responsibility Principle?

  - by Jon Kruger

  I'm looking for some good examples of code that violates the Single Responsibility Principle. Don't show me any examples from Uncle Bob's books or web sites since those are plastered all over the internet, like this one: interface Modem { public void dial(String pno); public void hangup(); public void send(char c); public char recv(); }

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• multi word query in mysql

  - by salmane

  Hi there , in order to make things easier for users i want to add multiple keyword search to my site. so that in the input the user would do something like : " keyword1 keyword 2" ( similar to google for example. would i need to write a code that would parse that string and do queries based on that or is there something built in mysql that could do it?

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• Spring properties (property-placeholder) autowiring

  - by peperg

  I have in my applicationContext.xml <context:property-placeholder location="classpath*:*.properties" /> <bean id="clientPreferencesManager" class="pl.bildpresse.bildchat2.business.ClientPreferencesManager" > <property name="clientApiUrl" value="${clientapi.url}" /> </bean> Is it possible to do the same by autowire ? Something like : @Autowired @Qualifier("${clientapi.url}") public void setClientApiUrl(String clientApiUrl) { this.clientApiUrl = clientApiUrl; }

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• How do I determine whether I am going "forward" or "backward" through my History in GWT?

  - by Stephen Cagle

  I am looking at History and History JavaDocs in GWT and I notice that there is no way to tell whether the forward or backward button was pressed (either pragmatically or by the user). The "button press" is handled by your registered addValueChangeHandler, but the only thing passed to the handler is a string on your history stack. There is no indication as to whether the "History" is moving "back" (using the back arrow button) or "forward" (using the right arrow button). Is there any way to determine this?

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• GWT combobox not displaying correctly

  - by James

  Hi, I am using GWT with GWT-EXT running in glassfish. I create 2 combo boxes as follows: import com.extjs.gxt.ui.client.widget.form.ComboBox; import com.extjs.gxt.ui.client.widget.form.SimpleComboBox; this.contentPanel = new ContentPanel(); this.contentPanel.setFrame(true); this.contentPanel.setSize((int)(Window.getClientWidth()*0.95), 600); this.contentPanel.setLayout(new FitLayout()); initWidget(this.contentPanel); SimpleComboBox<String> combo = new SimpleComboBox<String>(); combo.setEmptyText("Select a topic..."); combo.add("String1"); combo.add("String2"); this.contentPanel.add(combo); ComboBox combo1 = new ComboBox(); combo1.setEmptyText("Select a topic..."); ListStore topics = new ListStore(); topics.add("String3"); topics.add("String4"); combo.setStore(topics); this.contentPanel.add(combo1); When these are loaded in the browser (IE 8.0, Firefox 3.6.6 or Chrome 10.0) the combo boxes are shown but don't have the pull down arrow. They look like a text field with the "Select a topic..." text. When you select the text it disappears and if you type a character and then delete it the options are shown (i.e. pull down is invoked) however, there is still no pull down arrow. Does anyone know what the issue might be? Or how I can investigate further? Is it possible to see the actual HTML the browser is getting, when I View Page Source I only get the landing page HTML. As an additional I also have a import com.google.gwt.user.client.ui.Grid that does not render correctly. It is in table format but has no grid lines or header bar etc. Cheers, James

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• Retrieving/Updating Entity Framework POCO objects that already exist in the ObjectContext

  - by jslatts

  I have a project using Entity Framework 4.0 with POCOs (data is stored in SQL DB, lazyloading is enabled) as follows: public class ParentObject { public int ID {get; set;} public virtual List<ChildObject> children {get; set;} } public class ChildObject { public int ID {get; set;} public int ChildRoleID {get; set;} public int ParentID {get; set;} public virtual ParentObject Parent {get; set;} public virtual ChildRoleObject ChildRole {get; set;} } public class ChildRoleObject { public int ID {get; set;} public string Name {get; set;} public virtual List<ChildObject> children {get; set;} } I want to create a new ChildObject, assign it a role, then add it to an existing ParentObject. Afterwards, I want to send the new ChildObject to the caller. The code below works fine until it tries to get the object back from the database. The newChildObjectInstance only has the ChildRoleID set and does not contain a reference to the actual ChildRole object. I try and pull the new instance back out of the database in order to populate the ChildRole property. Unfortunately, in this case, instead of creating a new instance of ChildObject and assigning it to retreivedChildObject, EF finds the existing ChildObject in the context and returns the in-memory instance, with a null ChildRole property. public ChildObject CreateNewChild(int id, int roleID) { SomeObjectContext myRepository = new SomeObjectContext(); ParentObject parentObjectInstance = myRepository.GetParentObject(id); ChildObject newChildObjectInstance = new ChildObject() { ParentObject = parentObjectInstance, ParentID = parentObjectInstance.ID, ChildRoleID = roleID }; parentObjectInstance.children.Add(newChildObjectInstance); myRepository.Save(); ChildObject retreivedChildObject = myRepository.GetChildObject(newChildObjectInstance.ID); string assignedRoleName = retreivedChildObject.ChildRole.Name; //Throws exception, ChildRole is null return retreivedChildObject; } I have tried setting MergeOptions to Overwrite, calling ObjectContext.Refresh() and ObjectContext.DetectChanges() to no avail... I suspect this is related to the proxy objects that EF injects when working with POCOs. Has anyone run into this issue before? If so, what was the solution?

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