RegEx for detecting a string and a path in one go-CodePudding

Here is an example of what regex I need regex

I have many of these lines in a file

build test/testfoo/CMakeFiles/testfoo2.dir/testfoo2.cpp.o: CXX_COMPILER__testfoo2_Debug /home/juxeii/projects/gtest-cmake-example/test/testfoo/testfoo2.cpp || cmake_object_order_depends_target_testfoo2

I need to detect the string between CXX_COMPILER__ and _Debug, which here is testfoo2.

At the same time, I need to also detect the entire file path /home/juxeii/projects/gtest-cmake-example/test/testfoo/testfoo2.cpp, which comes always after the first match.

I could not figure out a regex for this. So far I have .*CXX_COMPILER__(.\w )_\w |(\/[a-zA-Z_0-9-] ) \.\w and I am using it in typescript like so:

const fileAndTargetRegExp = new RegExp('.*CXX_COMPILER__(.\w )_\w |(\/[a-zA-Z_0-9-] ) \.\w ', 'gm');
let match;
while (match = fileAndTargetRegExp.exec(fileContents)) {
          //do something
}

But I get no matches. Is there an easy way to do this?

CodePudding user response：

Will it always have the || <stuff here> at the end? If so, this regex based on the one you provided should work:

/.*CXX_COMPILER__(\w )_. ?((?:\/. ) ) \|\|.*/g

As the regex101 breakdown shows, the first capturing group should contain the string between CXX_COMPILER__ and _Debug, while the second should contain the path, using the space and pipes to detect where the latter ends.

let line = 'build test/testfoo/CMakeFiles/testfoo2.dir/testfoo2.cpp.o: CXX_COMPILER__testfoo2_Debug /home/juxeii/projects/gtest-cmake-example/test/testfoo/testfoo2.cpp || cmake_object_order_depends_target_testfoo2';
const matches = line.match(/.*CXX_COMPILER__(\w )_. ?((?:\/. ) ) \|\|.*/).slice(1); //slice(1) just to not include the first complete match returned by match!
for (let match of matches) {
    console.log(match);
}

If the pipes won't always be there, then this version should work instead (regex101):

.*CXX_COMPILER__(\w )_. ?((?:\/(?:\w|\.|-) ) ).*

But it requires you to add all of the valid path characters individually every time you realize a new one might be there, and you'll need to make sure the paths don't have spaces because adding space to the regex would make it detect the stuff after the path too.

CodePudding user response：

Looks good, but you need delimiters. Add "/" before and after your Regex - no quotation marks.

let fileContents = 'build test/testfoo/CMakeFiles/testfoo2.dir/testfoo2.cpp.o: CXX_COMPILER__testfoo2_Debug /home/juxeii/projects/gtest-cmake-example/test/testfoo/testfoo2.cpp || cmake_object_order_depends_target_testfoo2';

const fileAndTargetRegExp = new RegExp(/.*CXX_COMPILER__(.\w )_\w |(\/[a-zA-Z_0-9-] ) \.\w /, 'gm');
let match;

while (match = fileAndTargetRegExp.exec(fileContents)) {
    console.log(match);
}

CodePudding user response：

Here's my way of doing it with replace:

I need to detect the string between CXX_COMPILER__ and _Debug, which is here testfoo2.

Try to replace all characters of the string with just the first captured group $1 which is between CXX_COMPILER__ and _Debug:

/.*CXX_COMPILER__(\w )_Debug.*/
                  ^^^^<--testfoo2

I need to also detect the entire file path /home/juxeii/projects/gtest-cmake-example/test/testfoo/testfoo2.cpp

The same, just this time replace all just leave the second matched group which is anything comes after our first captured group:

/.*CXX_COMPILER__(\w )_Debug\s (.*?)(?=\\|\|).*/
                                ^^^<-- /home/.../testfoo2.cpp

let line = 'build test/testfoo/CMakeFiles/testfoo2.dir/testfoo2.cpp.o: CXX_COMPILER__testfoo2_Debug /home/juxeii/projects/gtest-cmake-example/test/testfoo/testfoo2.cpp || cmake_object_order_depends_target_testfoo2'

console.log(line.replace(/.*CXX_COMPILER__(\w )_Debug.*/gm,'$1'))
console.log(line.replace(/.*CXX_COMPILER__(\w )_Debug\s (.*?)(?=\\|\|).*/gm,'$2'))