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I am trying to build a regular expression to satisfy strings like the following: ${AnyTextHere}. This is what I have right now: \\${[a-zA-Z0-9]+} It works in some online regular expression checkers, but not with regcomp.
You may also have to escape curly braces {, as they are considered regex special characters.
\\$\\{[a-zA-Z0-9]+\\}
^ ^
see regex demo
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I want to use regex and I saw that the POSIX regular expression library provides functions but how do I include the library? Where to find the files? I googled a lot and did not find any manual.
Can anyone help me by providing a manual or a link to a manual? I am using Visual Studio Code
C by itself doesn't have regex, but there are multiple libraries providing this functionality, like:
PCRE and PCRE2 - http://www.pcre.org/
libgnurx - https://github.com/TimothyGu/libgnurx
TRE - http://laurikari.net/tre/about/
sregex - https://github.com/openresty/sregex
slre - https://github.com/cesanta/slre
liblightgrep - https://github.com/strozfriedberg/liblightgrep
RxSpencer - https://github.com/garyhouston/rxspencer
RE2 - https://github.com/google/re2/
Oniguruma - https://github.com/kkos/oniguruma
Onigmo - https://github.com/k-takata/Onigmo
Hyperscan - https://www.hyperscan.io/
And there are probably more regex libraries out there.
I have been able to compile all of the above from source for Windows using MinGW-w64.
Most commonly used are PCRE, PCRE2, libgnurx, but Oniguruma and Hyperscan are interesting alternatives.
If you're using C++ there is also std::regex or boost::regex.
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I am learning C language. I installed and configurated everything to start coding
But when I try to use ampersand (&) in scanf my program doesn't compile:
scanf("%f", &x);
I am getting this error:
The ampersand () character is not allowed. The & operator is reserved
for future use; wrap an ampersand in double quotation marks ("&") to
pass it as part of a string.
I don't think you have everything installed and configured correctly.
The error looks like a PowerShell error, not a C compilation error.
Get a C compiler like MinGW-w64 GCC from http://winlibs.com/ and make sure to compile your C code (there is an example on that website showing you how to compile from the Command Prompt).
Sorry my bad, I had to change my file extension from .cpp to .c to make it work correctly.
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In the middle of a code there is a C language statement. I don't know why it is there and how the compiler does not give back an error. Is it for C binding? Does it mean that this module can be used by C program or vice versa?
USE LISTS
USE LINKEDLIST_ROUTINES
#include "macros.h"
IMPLICIT NONE
PRIVATE
It is not a C language statement, but a C preprocessor (cpp) statement.
Any text file can use the preprocessor, even Fortran source codes, but you must call the preprocessor before compiling.
Many Fortran compilers will call the preprocessor for you with flags -cpp or -fpp or similar. They might also call it for you if the file suffix starts with capital F.
What the #include "file" does is the same as what it does in C source files, it inserts the text from the file in that location.
There is also a standard Fortran (90+) statement include. It is similar, but happens after any eventual pre-processing has been done, see Includes revealing with Fortran preprocessor for more.
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I'm doing some coding using cygwin with c programming. There is no sound with \a. Do I have to install some packages? There is no problem with cl compiler.
#include <stdio.h>
int main()
{
printf("\a");
return 0;
}
with the following setting
gcc test.c -o fun.exe
I am going to guess that it has something to do with the terminal emulator you are using. I am using mintty. When I edit the options, I am able to specify the behavior of "Bell".
When uncheck "Sound" I don't hear anything. When I check "Sound", I hear a beep.
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I wrote a php extension: https://github.com/binpack/binpack-php, it works great and I want to submit this extension to PECL.
But they said that my code is C99 style and PHP except C89 style. I read somethings about C99 and C89.
And figure out some difference:
stdbool.h
inline vs __inline__
I think there are some problem in these 2 files:
https://github.com/binpack/binpack-php/blob/master/bin_pack.c
https://github.com/binpack/binpack-php/blob/master/bin_pack.h
I modified some of my code and used -std=gnu89 to test them. But I am not sure if there are still some problems.
My question is:
How can I test if my code is c89 style?
If anyone can point out the problems in my code, that will be great.
It won't warn about every feature not in C89, but
gcc -Wall -pedantic -std=c89 ...
is a good place to start.