Question

我有以下文字：

id number primary key,
domain_name varchar2(100),
server_name varchar2(100),
create_date date,
create_by varchar2(100),
valid_from date,
valid_till date,
default_user varchar2(100),
default_password varchar2(100),
server_order number

我想替换number和varchar2(100)。基本上，我只想保留第一列。我知道我可以在Unix中用awk来做，但是如何使用正则表达式呢？另外，可以从行的末尾搜索正则表达式吗？

(django_project) 16:19 ~/djangoPlay/theRightWay (master)$ cat /tmp/tx1 | awk '{print $1,","}

id ,
domain_name ,
server_name ,
create_date ,
create_by ,
valid_from ,
valid_till ,
default_user ,
default_password ,
server_order ,

Answer 1

你想要的正则表达式是#include <iostream> #include <SDL2/SDL.h> #include <SDL2/SDL_opengl.h> #include <stdio.h> #include <OpenGL/gl.h> #include <string.h> using namespace std; //Screen dimension constants const int SCREEN_WIDTH = 640; const int SCREEN_HEIGHT = 480; bool SetOpenGLAttributes() { // SDL_GL_CONTEXT_CORE gives us only the newer version, deprecated functions are disabled SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2); SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); return true; } int main( int argc, char* args[] ) { SDL_Window* window = NULL; //Initialize SDL if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) { printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() ); } else { //Create window window = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_OPENGL ); if( window == NULL ) { printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() ); } else { //creating new context SDL_GL_CreateContext(window); SetOpenGLAttributes(); SDL_GL_SetSwapInterval(1); //cube front glBegin(GL_POLYGON); glColor3f(1.0, 0.0, 0.0); glVertex3f(-.5, .5, -.5); glVertex3f(.5, .5, -.5); glVertex3f(.5, -.5, -.5); glVertex3f(-.5, -.5, -.5); glEnd(); //cube top glBegin(GL_POLYGON); glColor3f(1.0,0.0,0.0); glVertex3f(-.5,.5,-.5); glVertex3f(.5, .5, -.5); glVertex3f(.5, .5, .5); glVertex3f(-.5, .5, .5); glEnd(); //cube bottom glBegin(GL_POLYGON); glColor3f(1.0, 0.0, 0.0); glVertex3f(-.5,-.5,-.5); glVertex3f(.5, -.5, -.5); glVertex3f(.5, -.5, .5); glVertex3f(-.5, -.5, .5); glEnd(); //cube right glBegin(GL_POLYGON); glColor3f(1.0, 0.0, 0.0); glVertex3f(.5, -.5, -.5); glVertex3f(.5, -.5, .5); glVertex3f(.5, .5, .5); glVertex3f(.5, .5, -.5); glEnd(); //cube left glBegin(GL_POLYGON); glColor3f(1.0, 0.0, 0.0); glVertex3f(-.5, -.5, -.5); glVertex3f(-.5, .5, -.5); glVertex3f(-.5, .5, .5); glVertex3f(-.5, -.5, .5); glEnd(); //cube back glBegin(GL_POLYGON); glColor3f(1.0, 0.0, 0.0); glVertex3f(-.5, .5, .5); glVertex3f(-.5, -.5, .5); glVertex3f(.5, -.5, .5); glVertex3f(.5, .5, .5); glEnd(); glFlush(); SDL_GL_SwapWindow(window); bool running = true; while(running){ glRotatef(1, 1, 0, 0); glFlush(); SDL_GL_SwapWindow(window); SDL_Delay(100); } } } //Destroy window //SDL_DestroyWindow( window ); //Quit SDL subsystems //SDL_Quit(); return 0; }。这将捕获空间之前的任何东西（用于其他地方）并抛弃其余部分。

^(.*) .+$表示＆＃34;从行的开头开始＆＃34;，^表示结尾相同。

Answer 2

你可以使用一个简单的s/ .*//g，这将删除从每行第一个空格到行尾的所有内容。

从正则表达式的行尾搜索

2 个答案: