wildcard

问题 Suppose I have three dataframes called A1-pre, B3-pos, B4-pre and I want to merge these dataframes. The columns have the same name, so I can use rbind. newdf <- rbind(A1-pre, B3-pos, B4-pre) #this would work However, I do not want to manually input all the names of the dataframes myself, I rather use a wildcard for that, so something like newdf <- rbind(grep(-)) #but this does not work Any idea how I could do that? Or even better, matching any dataframe named "pre" or "pos" and rbind them all

问题 For example, I can delete all .exe files using the following wildcard: del *.exe How can I do the opposite, i.e. delete all files that do not end in .exe ? 回答1: You can try this. FOR /R [directory] %%F IN (*.*) DO IF NOT "%%~xF" == ".[extension]" DEL /F /S "%%F" Or, if you have only one .exe file, it’s even simpler. for %i in (*.*) do if not %i == FILE.EXE del %i 回答2: There's no direct way, here's one scriptless way to do it: Create a subdirectory. Copy all *.exe* files to the subdirectory.

问题 In a project where for instance a parser is involved, some source code is the product of a program. For instance yacc generates - based on a .yy file - a source code file that implements the parser. Since small modifications in the .yy file can lead to large changes in the corresponding source code file after compilation and since the resulting source code is (almost) never altered after it is generated. Such source code files are perfect candidates for the .gitignore list. Now one can of

问题 I want to search for titles using shell wildcards like *.js , *.*.* etc. in js. The thing is I loop through a list of titles and I need to filter the files using a js regex test. How do I convert shell wildcards to regex in a good way or are there any libraries that already does that? Note: I want a generic converter from shell wildcards to regex. 回答1: If you want a generic converter function, this should work: function globStringToRegex(str) { return new RegExp(preg_quote(str).replace(/\\\*

问题 I observe a strange behavior of wildcard expansion behavior for Java7 on Windows. For centuries there was a clean difference between "*" versus *. Seems this it not longer true for Java7 (at least on Windows7). I noticed the problem when using a wildcard classpath. In despite of quoting the wildcard-classpath it gets expanded. Thus it seems not possible any more to pass a wildcard to the java application. So using java -cp "somewhere/*" will fail (as does "somewhere\*" ). A workaround seems

问题 I observe a strange behavior of wildcard expansion behavior for Java7 on Windows. For centuries there was a clean difference between "*" versus *. Seems this it not longer true for Java7 (at least on Windows7). I noticed the problem when using a wildcard classpath. In despite of quoting the wildcard-classpath it gets expanded. Thus it seems not possible any more to pass a wildcard to the java application. So using java -cp "somewhere/*" will fail (as does "somewhere\*" ). A workaround seems

问题 I am writing a Makefile, and I want to use a generic rule with wildcards, like %: bkp/% cp $< $@ But I wanted this rule to be valid only for a few specific files. I wanted to define a variable with the list, for example file_list = foo.c bar.c zzz.c and configure the rule so it is only valid for files that are listed in this variable. How do I do that? 回答1: You want a static pattern rule: file_list = foo.c bar.c zzz.c $(file_list): %: bkp/% cp $< $@ The syntax is very similar to the implicit

问题 I have to look for a PDF manual using this query: root@localhost:test> select * from a where name like '%taz_manual%.pdf%'; +--------------------+------------------+-------------+ | name | description | size | +--------------------+------------------+-------------+ | taz-manual-1.1.pdf | Manual v1.0 TA-Z | 31351902 | | taz-manual-0.2.pdf | Manual v1.0 T1-A | 3578278 | | taz_manual-2.0.pdf | Manual v2.0 GA-X | 542578278 | etc........ +--------------------+------------------+-------------+ 132

问题 I'd like to check if there are any .rar files in a directory. it doesn’t need to be recursive. Using wildcard with os.path.isfile() was my best guess, but it doesn't work. What can I do then? Thanks. 回答1: glob is what you need. >>> import glob >>> glob.glob('*.rar') # all rar files within the directory, in this case the current working one os.path.isfile() returns True if a path is an existing regular file. So that is used for checking whether a file already exists and doesn't support

问题 Having an @WebServlet(urlPatterns = "/myServlet/") . If the user goes to myapp/myServlet/other , I still want my servlet to catch. So to say, wildcard anything on after the servlet path. How could I do this? 回答1: You can use * as prefix or suffix wildcard. In your case, you can use /myServlet/* for a folder mapping. @WebServlet("/myServlet/*") The path info (the part after the mapping in the URL) is in the servlet by the way available as: String pathInfo = request.getPathInfo(); This would in