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• Count the number of times a string appears within a string...

  - by onekidney

  I simply have a string that looks something like this: "7,true,NA,false:67,false,NA,false:5,false,NA,false:5,false,NA,false" All I want to do is to count how many times the string "true" appears in that string. I'm feeling like the answer is something like String.CountAllTheTimesThisStringAppearsInThatString() but for some reason I just can't figure it out. Help?

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• Java String object creation

  - by Ajay

  Hi, 1) What is difference in thers two statements: String s1 = "abc"; and String s1 = new String("abc") 2) as i am not using new in first statement, how string object will be created Thanks

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• Make a String text Bold in Java Android

  - by meskh

  I want to make Habit Number: bold , I tried the HTML tag but it didn't work. I did some research but couldn't find any. Hope someone is able to help me. Thanks! String habitnumber = "Habit Number: " + String.valueOf(habitcounter); String Title = habit.getTitle(); String description = habit.getDescription(); //Set text for the row tv.setText(habitnumber+ "\n" + Title + " \n" + description + "\n --------------------");

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• c++ std::ostringstream vs std::string::append

  - by NickSoft

  In all examples that use some kind of buffering I see they use stream instead of string. How is std::ostringstream and << operator different than using string.append. Which one is faster and which one uses less resourses (memory). One difference I know is that you can output different types into output stream (like integer) rather than the limited types that string::append accepts. Here is an example: std::ostringstream os; os << "Content-Type: " << contentType << ";charset=" << charset << "\r\n"; std::string header = os.str(); vs std::string header("Content-Type: "); header.append(contentType); header.append(";charset="); header.append(charset); header.append("\r\n"); Obviously using stream is shorter, but I think append returns reference to the string so it can be written like this: std::string header("Content-Type: "); header.append(contentType) .append(";charset=") .append(charset) .append("\r\n"); And with output stream you can do: std::string content; ... os << "Content-Length: " << content.length() << "\r\n"; But what about memory usage and speed? Especially when used in a big loop. Update: To be more clear the question is: Which one should I use and why? Is there situations when one is preferred or the other? For performance and memory ... well I think benchmark is the only way since every implementation could be different. Update 2: Well I don't get clear idea what should I use from the answers which means that any of them will do the job, plus vector. Cubbi did nice benchmark with the addition of Dietmar Kühl that the biggest difference is construction of those objects. If you are looking for an answer you should check that too. I'll wait a bit more for other answers (look previous update) and if I don't get one I think I'll accept Tolga's answer because his suggestion to use vector is already done before which means vector should be less resource hungry.

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• What is the structure of network managers system-connections files?

  - by Oyks Livede

  could anyone list the complete structure of the configuration files, which network manager stores for known networks in /etc/NetworkManager/system-connections for known networks? Sample (filename askUbuntu): [connection] id=askUbuntu uuid=81255b2e-bdf1-4bdb-b6f5-b94ef16550cd type=802-11-wireless [802-11-wireless] ssid=askUbuntu mode=infrastructure mac-address=00:08:CA:E6:76:D8 [ipv6] method=auto [ipv4] method=auto I would like to create some of them by my own using a script. However, before doing so I would like to know every possible option. Furthermore, this structure seems somehow to resemble the information you can get using the dbus for active connections. dbus-send --system --print-reply \ --dest=org.freedesktop.NetworkManager \ "$active_setting_path" \ # /org/freedesktop/NetworkManager/Settings/2 org.freedesktop.NetworkManager.Settings.Connection.GetSettings Will tell you: array [ dict entry( string "802-11-wireless" array [ dict entry( string "ssid" variant array of bytes "askUbuntu" ) dict entry( string "mode" variant string "infrastructure" ) dict entry( string "mac-address" variant array of bytes [ 00 08 ca e6 76 d8 ] ) dict entry( string "seen-bssids" variant array [ string "02:1A:11:F8:C5:64" string "02:1A:11:FD:1F:EA" ] ) ] ) dict entry( string "connection" array [ dict entry( string "id" variant string "askUbuntu" ) dict entry( string "uuid" variant string "81255b2e-bdf1-4bdb-b6f5-b94ef16550cd" ) dict entry( string "timestamp" variant uint64 1383146668 ) dict entry( string "type" variant string "802-11-wireless" ) ] ) dict entry( string "ipv4" array [ dict entry( string "addresses" variant array [ ] ) dict entry( string "dns" variant array [ ] ) dict entry( string "method" variant string "auto" ) dict entry( string "routes" variant array [ ] ) ] ) dict entry( string "ipv6" array [ dict entry( string "addresses" variant array [ ] ) dict entry( string "dns" variant array [ ] ) dict entry( string "method" variant string "auto" ) dict entry( string "routes" variant array [ ] ) ] ) ] I can create new setting files using the dbus (AddSettings() in /org/freedesktop/NetworkManager/Settings) passing this type of input, so explaining me this structure and telling me all possible options will also help. Afaik, this is a Dictionary{String, Dictionary{String, Variant}}. Will there be any difference creating config files directly or using the dbus?

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• How can I identify unknown query string fragments that are coming to my site?

  - by Jon

  In the Google Analytics content overview for a site that I work on, the home page is getting many pageviews with some unfamiliar query string fragments, example: /?jkId=1234567890abcdef1234567890abcdef&jt=1&jadid=1234567890&js=1&jk=key words&jsid=12345&jmt=1 (potentially identifiable IDs have been changed) It clearly looks like some kind of ad tracking info, but noone who works on the site knows where it comes from, and I haven't been able to find any useful information from searching. Is there some listing of common query string keys available anywhere? Alternatively, does anyone happen to know where these keys (jkId, jt, jadid, js, jk, jsid and jmt) might come from?

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• Literals that precede { in spark view engine.

  - by Quintin Par

  I was going through the spark view engine documentation and found a lot of literals showing up in code for which I couldn’t find any references. For e.g. ! , #, $ , !$ , ... What are these for? What do the combinations mean? When do they come into use? Am I missing any more literals that precede or comes after {

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• Java StringTokenizer, empty null tokens

  - by user69514

  I am trying to split a string into 29 tokens..... stringtokenizer won't return null tokens. I tried string.split, but I believe I am doing something wrong: String [] strings = line.split(",", 29); sample inputs: 10150,15:58,23:58,16:00,00:00,15:55,23:55,15:58,00:01,16:03,23:58,,,,,16:00,23:22,15:54,00:03,15:59,23:56,16:05,23:59,15:55,00:01,,,, 10155,,,,,,,,,,,07:30,13:27,07:25,13:45,,,,,,,,,,,07:13,14:37,08:01,15:23 10160,10:00,16:02,09:55,16:03,10:06,15:58,09:48,16:07,09:55,16:00,,,,,09:49,15:38,10:02,16:04,10:00,16:00,09:58,16:01,09:57,15:58,,,,

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• High performance text file parsing in .net

  - by diamandiev

  Here is the situation: I am making a small prog to parse server log files. I tested it with a log file with several thousand requests (between 10000 - 20000 don't know exactly) What i have to do is to load the log text files into memory so that i can query them. This is taking the most resources. The methods that take the most cpu time are those (worst culprits first): string.split - splits the line values into a array of values string.contains - checking if the user agent contains a specific agent string. (determine browser ID) string.tolower - various purposes streamreader.readline - to read the log file line by line. string.startswith - determine if line is a column definition line or a line with values there were some others that i was able to replace. For example the dictionary getter was taking lots of resources too. Which i had not expected since its a dictionary and should have its keys indexed. I replaced it with a multidimensional array and saved some cpu time. Now i am running on a fast dual core and the total time it takes to load the file i mentioned is about 1 sec. Now this is really bad. Imagine a site that has tens of thousands of visits a day. It's going to take minutes to load the log file. So what are my alternatives? If any, cause i think this is just a .net limitation and i can't do much about it.

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• error C2440: '=' : cannot convert from 'std::string []' to 'std::string []'

  - by Bach

  now what is wrong with this code! Header: #pragma once #include <string> using namespace std; class Menu { public: Menu(string []); ~Menu(void); }; Implementation: #include "Menu.h" string _choices[]; Menu::Menu(string items[]) { _choices = items; } Menu::~Menu(void) { } compiler is complaining: error C2440: '=' : cannot convert from 'std::string []' to 'std::string []' There are no conversions to array types, although there are conversions to references or pointers to arrays there is no conversion! so what is it on about? please help, just need to pass a bloody array of strings and set it to Menu class _choices[] attribute. thanks

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• C# assign char and char array to string?

  - by Bopha

  char character = 'c'; string str = null; str = character.ToString();//this is ok char[] arrayChar = { 'a', 'b', 'c', 'd' }; string str2 = null; str2 = string.Copy(arrayChar.ToString());//this is not ok str2 = arrayChar.ToString();//this is not ok. I'm trying to converting char array to string, but the last two attempts don't work. Other source I found and they have to create new string type, but I don't know why. Can someone give me little explaination, thanks.

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• How many significant digits should I use for double literals in Java?

  - by M. Dudley

  How many significant digits should I use when defining a double literal in Java? This is assuming that I am trying to represent a number with more significant figures than a double can hold. In Math.java I see 20 and 21: public static final double E = 2.7182818284590452354; public static final double PI = 3.14159265358979323846; This is more than the 15-17 significant digits provided by IEEE 754. So what's the general rule-of-thumb?

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• Extracting URLs (to array) in Ruby

  - by FearMediocrity

  Good afternoon, I'm learning about using RegEx's in Ruby, and have hit a point where I need some assistance. I am trying to extract 0 to many URLs from a string. This is the code I'm using: sStrings = ["hello world: http://www.google.com", "There is only one url in this string http://yahoo.com . Did you get that?", "The first URL in this string is http://www.bing.com and the second is http://digg.com","This one is more complicated http://is.gd/12345 http://is.gd/4567?q=1", "This string contains no urls"] sStrings.each do |s| x = s.scan(/((http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.[\w-]*)?)/ix) x.each do |url| puts url end end This is what is returned: http://www.google.com http .google nil nil http://yahoo.com http nil nil nil http://www.bing.com http .bing nil nil http://digg.com http nil nil nil http://is.gd/12345 http nil /12345 nil http://is.gd/4567 http nil /4567 nil What is the best way to extract only the full URLs and not the parts of the RegEx? Thanks Jim

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• Encoding a string as an integer .NET

  - by Paul Knopf

  I have a string that I would like represented uniquely as an integer. For example: A3FJEI = 34950140 How would I go about writing a EncodeAsInteger(string) method. I understand that the amount of characters in the string will make the integer increase greatly, forcing the value to become a long, not an int. Since I need the value to be an integer, I don't need the numerical representation to be entirely unique to the string. Maybe I can foreach through all the characters of the string and sum the numerical keycode of the character.

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• String cannot contain any part of another string .NET 2.0

  - by Aaron

  I'm looking for a simple way to discern if a string contains any part of another string (be that regex, built in function I don't know about, etc...). For Example: string a = "unicorn"; string b = "cornholio"; string c = "ornament"; string d = "elephant"; if (a <comparison> b) { // match found ("corn" from 'unicorn' matched "corn" from 'cornholio') } if (a <comparison> c) { // match found ("orn" from 'unicorn' matched "orn" from 'ornament') } if (a <comparison> d) { // this will not match } something like if (a.ContainsAnyPartOf(b)) would be too much to hope for. Also, I only have access to .NET 2.0. Thanks in advance!

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• Obtaining reference to Class instance by string name - VB.NET

  - by Jeff Williams

  Is it possible using Reflection or some other method to obtain a reference to a specific class instance from the name of that class instance? For example the framework for the applications i develop heavily uses public class instances such as: Public bMyreference as MyReference = new MyReference Then throughout the application bMyReference is used by custom controls and code. One of the properties of the custom controls is the "FieldName" which references a Property in these class instances (bMyReference.MyField) as a string. What i would like to be able to do is analyze this string "bMyReference.MyField" and then refer back to the actual Instance/Property. In VB6 I would use an EVAL or something simular to convert the string to an actual object but this obviously doesn't work in VB.net What I'm picturing is something like this Dim FieldName as String = MyControl.FieldName ' sets FielName to bMyReference.MyField Dim FieldObject() as String = FieldName.Split(".") ' Split into the Object / Property Dim myInstance as Object = ......... ' Obtain a reference to the Instance and set as myInstance Dim myProperty = myInstance.GetType().GetProperty(FieldObject(1))

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• string parse and replace in for loop

  - by reffer

  i have a string that looks like this - "1AL||9CA||34CO||196WY||..." i want to use a for loop or while loop, in which if i have an integer, it should parse this string and delete the value matching that integer. example for above string string = "1AL||9CA||34CO||196WY||..." integer = 34 for ... loop new string = "1AL||9CA||196WY||..." As you can see the integer matched the integer 34 and deleted from one delimeter "||" to th next one. how can i do this?

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• PHP if string contains URL isolate it

  - by Dylan Taylor

  In PHP, I need to be able to figure out if a string contains a URL. If there is a URL, I need to isolate it as another separate string. For example: "SESAC showin the Love! http://twitpic.com/1uk7fi" I need to be able to isolate the URL in that string into a new string. At the same time the URL needs to be kept intact in the original string. Follow? I know this is probably really simple but it's killing me.

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• Why is String final in Java?

  - by Alex

  From when I learned that the class java.lang.String is declared as final in Java, I was wondering why is that? I didn't find any answer back then, but this post: How to create a replica of String class in Java? reminded me of my query. Sure, String provides all the functionality I ever needed, and never thought of any operation that would require an extension of class String, but still you'll never know what someone might need! So, does anyone know what was the intent of the designers when they decided to make it final? See also: Why is String a sealed class in C#?

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• How to concatenate two strings on iPhone?

  - by iPhoney

  How to connect string "Hello" and string "World" to "HelloWorld"? Looks like "+" doesn't work.

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• Best practice or performance difference between ToString() and & concatenation

  - by slolife

  When I am concatenating object values together to form a string in VB.NET, is there a difference in performance or a recommended best practice between using the & concat or the + concat with calls to .ToString() on each object? Example (which is faster or best practice): Dim result1 As String = 10 & "em" Dim result2 As String = 10.ToString() + "em"

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• Issue with string in c#

  - by user1740381

  I have a problem with string in c#. I have following string : Here Fonts is the string array contains google fonts name : string fontsLink = "<link rel='stylesheet' id='fontrequest' href='http://fonts.googleapis.com/css?family='" + Fonts + "type='text/css' media='all'>"; this string is rendering wrong in the browser : <link rel="stylesheet" id="fontrequest" href="http://fonts.googleapis.com/css?family=" times+new+roman|offside|dangrek|days+onetype="text/css" media="all"> The problem is with the href attribute value. How can i solve this ?

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• I need to iterate a loop to every time find the string appearing after a particular string say "if(O

  - by Parth

  I need to iterate a loop to every time find the string appearing after a particular string say "if(OLD.", then which PHP function will be helpful for me? Suppose I have a variable say, $string, according to any select query say "select * friends", Now any of its value contain a string say "how are you Jack?" Now I want to iterate a loop around the above value containing variable to get the varying name of friends after a string "how are you "... Hence I need a function of PHP to accomplish it... Please help

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• Is concatenating with an empty string to do a string conversion really that bad?

  - by polygenelubricants

  Let's say I have two char variables, and later on I want to concatenate them into a string. This is how I would do it: char c1, c2; // ... String s = "" + c1 + c2; I've seen people who say that the "" + "trick" is "ugly", etc, and that you should use String.valueOf or Character.toString instead. I prefer this construct because: I prefer using language feature instead of API call if possible In general, isn't the language usually more stable than the API? If language feature only hides API call, then even stronger reason to prefer it! More abstract! Hiding is good! I like that the c1 and c2 are visually on the same level String.valueOf(c1) + c2 suggests something is special about c1 It's shorter. Is there really a good argument why String.valueOf or Character.toString is preferrable to "" +? Trivia: in java.lang.AssertionError, the following line appears 7 times, each with a different type: this("" + detailMessage);

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• small string optimization for vector?

  - by BuschnicK

  I know several (all?) STL implementations implement a "small string" optimization where instead of storing the usual 3 pointers for begin, end and capacity a string will store the actual character data in the memory used for the pointers if sizeof(characters) <= sizeof(pointers). I am in a situation where I have lots of small vectors with an element size <= sizeof(pointer). I cannot use fixed size arrays, since the vectors need to be able to resize dynamically and may potentially grow quite large. However, the median (not mean) size of the vectors will only be 4-12 bytes. So a "small string" optimization adapted to vectors would be quite useful to me. Does such a thing exist? I'm thinking about rolling my own by simply brute force converting a vector to a string, i.e. providing a vector interface to a string. Good idea?

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