C++ custom problem matchers in VS Code not highlighting file paths - visual-studio-code

Question

I have a bunch of custom build tasks in VS Code and I want a custom problem matcher for the C++ ones.
So I decided to take the default problem matcher example in VS Code docs (https://code.visualstudio.com/Docs/editor/tasks#_defining-a-problem-matcher) and modified it slightly.
"problemMatcher": {
"fileLocation": ["relative", "${workspaceFolder}"],
"pattern": {
"regexp": "^(\\.\\.\\/+)(.*):(\\d+):(\\d+):\\s+(.*):\\s+(.*)$",
"file": 2,
"line": 3,
"column": 4,
"severity": 5,
"message": 6
}
My error messages have the following structure:
../../../module/src/module/specific/File.cpp:155:31: error: errorMessage
The three directory-up instructions (../../../) bring me back to ${workspaceFolder}. So the idea was to use the second capture group as a relative path from my workspace folder to follow up to the file.
Unfortunately, the file path does not highlight and it doesn't tell me to Ctrl+click to follow the message. I double checked the regex on https://regexr.com/ and it seems to be correct. I tried using the the default problem matcher too, without any luck.
This is the full build task:
{
"label": "build_c++",
"type": "shell",
"command": "${workspaceFolder}/build_command",
"problemMatcher": [ {
"fileLocation": ["relative", "${workspaceFolder}"],
"pattern": {
"regexp": "^(\\.\\.\\/+)(.*):(\\d+):(\\d+):\\s+(.*):\\s+(.*)$",
"file": 2,
"line": 3,
"column": 4,
"severity": 5,
"message": 6
}
}],
"group": {
"kind": "build",
"isDefault": true
}
},
Any ideas?