Python - efficient method to remove all non-letters and replace them with underscores.
def format_title(title): ''.join(map(lambda x: x if (x.isupper() or x.islower()) else '_', title.strip())) Anything faster? ...
string
In bash, how can I check if a string begins with some value?
Hi, I would like to check if a string begins with "node" e.g. "node001". Something like if [ $HOST == user* ] then echo yes fi How can I do it correctly？ Thanks! UPDATE: Thank you so much! I further need to combine expressions to check if HOST is either "user1" or begins with "node" if [ [[ $HOST == user1 ]] -o [[ $HO...
Are there any reasons why the StringPiece/StringRef idiom is not more popular?
From the documentation of the StringPiece class in Chromium's source code: // A string-like object that points to a sized piece of memory. // // Functions or methods may use const StringPiece& parameters to accept either // a "const char*" or a "string" value that will be implicitly converted to // a StringPiece. // // Systematic usag...
ASCII raw symbols to control a printer from a .txt file
A label printer is controled by sending a string of raw ASCII characters (which formats a label). Like this: string s = "\x02L\r" + "D11\r" + "ySWR\r" + "421100001100096" + date + "\r" + "421100002150096" + time + "\r" + "421100001200160" + price + "\r" + "E\r"; RawPrinterHelper.SendStringToPrinter(printerName, s); This hardcoded v...
How do we know that a string element in C is uninitialized?
Is there a way to know whether the element in a string in C has a value or not? I have tried using NULL, '', and ' ', but they don't seem to be working. I need to shift the characters down to index 0 without using stdlib functions. #include <stdio.h> int main() { char literal[100]; //literal[99] = '\0' literal[98] = 'O'; ...
Why isn't string assignment optimised when the length is known to the compiler?
I was playing around today with some timing code and discovered that when asigning a string literal to std::string, that it was around 10% faster (with a short 12 char string, so likly even bigger difference for large strings) to do so with a literal of known length (using the sizeof operator) than not. (Only tested with the VC9 compiler...
Remove '\n.\n' C++
If i have a string as such "I am not here... \n..Hello\n.\n....Whats happening" I want to replace the above string so: "I am not here... \n..Hello\n. \n....Whats happening" ^ Space added Just a bit of a background on what im doing. Im using sendmail in C++ and \n.\n is End Of Message Equivalent of sen...
Regular Expression to validate the field: Field Data should not contain brackets.
Hi all, [dbo].[Regex]('^[-a-zA-Z0-9,&''.@#/:;]+$',@ClaimantMailingAddressLine1) above is my regular expression when i am passing '(' or ')'brackets symbol it is nt returnig error... please hw 2 do this.... and please teach me how to eliminate perticular character is a invalid thing. rite now wt ever symbol is present in brackets i.e...
What is the difference Between Assignment and Creating Instance of String?
In an interview question, Interviewer asked me What is the common and difference between the following statements: String s = "Test"; String s = new String("Test"); Is there any difference in memory allocation? ...
define a long complex literal string
Hi, I have a string that is quite long and complicated, with special characters inside. I want to define this string as a variable, but don't want to escape each of them (because there are so many). I remember that in XML they have a special syntax for that, is there something similar for Objective-C? Edit: I know I can save the thing ...
C++ bitwise operators for std::string
Hi, my question is about how to use bitwise operators on C++ std::string... through overloading or as function does not matter Example for an working XOR/^ function for std::string: std::string XOR(std::string value, std::string key) { std::string retval(value); long unsigned int klen = key.length(); long unsigned int vlen = val...
Trying to write a pleasant parser
I am writing a simple parser that will take a string of the format 20100101,1,2,foo and create an instance of the following class: public class Foo { public DateTime TheDate { get; set; } public int TheFirstInt { get; set; } public int TheSecondInt { get; set; } public string TheString { get; set; } } I would like to b...
Need to convert String^ to char *
I am using the .NET DateTime to get the current date and time. I am converting it to a string to use as part of a file name. The problem is the OpenCV command to save an image requires a char * not a string type, and DateTime will only output a String^ type. How do I make this work? Heres the code not completed String^ nowString = DateT...
small string optimization for vector?
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 wit...
Pass C# string to C++ and pass C++ result (string, char*.. whatever) to C#
I tried different things but i'm getting mad with Interop. (here the word string is not referred to a variabile type but "a collection of char"): I have an unmanaged C++ function, defined in a dll, that i'm trying to access from C#, this function has a string parameter and a string return value like this: string myFunction(string input...
Finding a string within a string
How can i show this? substring?split? ... but it's maybe dynamic !!! String str = "SET ENCALSUP=NOENCR&GSMV2,MAXNCELL=16,TDTMWIND=5,MAXLAPDMN=5,EENHDTMSUP=DISABLED,T3197=4,PAGCOORCLB=DISABLED,DGRSTRGYBCNT=DISABLED,PAGQOVLIND=0;"; this output (EENHDTMSUP=DISABLED): just this DISABLED Thanks ... ...
Adding backslashes without escaping [Python]
I need to escape a & character in a string. The problem is whenever I string = string.replace ('&', '\&') the result is '\\&'. An extra backslash is added to escape the original backslash. How do I remove this extra backslash? ...
asp - Cannot find method 'IsNullOrEmpty(String)' in 'String'
Trying to only print if a string isn't empty, and am using the code below, but it keeps coming up with that error... <%if(!String.IsNullOrEmpty(o_handler.renderDesc())) { %> <strong>Description:</strong><BR> <HR SIZE="1"> <strong><%= o_handler.renderDesc()%></stro...
Is there a C function to find the second occurrence of substring in string?
Is there a C function to find the second occurrence of sub-string in string? i.e. String - "213 File status 550 Access Denied. 550 Access Denied." This function would return "550 found twice".... ...
how to deal with quotes in a string when passing that string to the command line
I can't get my head around quotes. EG, I have a string for an mp3 with quotes: string ARTIST = "John \"The Man\" Doe" I then want to pass this to a command line WITH the escape sequences. I therefore need my string to look like (I think): ARTIST = "John \\\"The Man\\\" Doe" So it looks like, for every time I have an (actual) " in ...