Does the VSCode problem matcher strip ANSI escape sequences before matching? - visual-studio-code

Question

I'm making a custom task to run Perl unit tests with yath. The output of that command contains details about failed tests, which I would like to filter and display as problems.
I've written the following matcher for the my output.
"problemMatcher": {
"owner": "yath",
"fileLocation": [ "relative", "${workspaceFolder}" ],
"severity": "error",
"pattern": [
{
"regexp": "\\[\\s*FAIL\\s*\\]\\s*job\\s*\\d+\\s*\\+?\\s*(.+)",
"message": 1,
},{
"regexp": "\\(\\s*DIAG\\s*\\)\\s*job\\s*\\d+\\s*\\+?\\s*at (.+) line (\\d+)\\.",
"file": 1,
"line": 2
}
]
}
This is supposed to match two different lines in the following output, which I will present as code for copying, and as a screenshot.
** Defaulting to the 'test' command **
( LAUNCH ) job 1 t/foo.t
( NOTE ) job 1 Seeded srand with seed '20220414' from local date.
[ PASS ] job 1 + passing test
[ FAIL ] job 1 + failing test
( DIAG ) job 1 Failed test 'failing test'
( DIAG ) job 1 at t/foo.t line 57.
[ PLAN ] job 1 Expected assertions: 2
( FAILED ) job 1 t/foo.t
( TIME ) job 1 Startup: 0.30841s | Events: 0.01992s | Cleanup: 0.00417s | Total: 0.33250s
< REASON > job 1 Test script returned error (Err: 1)
< REASON > job 1 Assertion failures were encountered (Count: 1)
The following jobs failed:
+--------------------------------------+-----------------------------------+
| Job ID | Test File |
+--------------------------------------+-----------------------------------+
| e7aee661-b49f-4b60-b815-f420d109457a | t/foo.t |
+--------------------------------------+-----------------------------------+
Yath Result Summary
-----------------------------------------------------------------------------------
Fail Count: 1
File Count: 1
Assertion Count: 2
Wall Time: 0.74 seconds
CPU Time: 0.76 seconds (usr: 0.20s | sys: 0.00s | cusr: 0.49s | csys: 0.07s)
CPU Usage: 103%
--> Result: FAILED <--
But it's actually pretty with colours.
I suspect there are ANSI escape sequences in this output. I could pass a flag to yath to make it not print colours, but I would like to be able to read this output as well, so that isn't ideal.
Do I have to change my pattern to match the escape sequences (I can read the source of the program that prints them, but it's annoying), or are they in fact stripped out and my pattern is wrong, but I can't see where?
Here's the first pattern as a regex101 match, and here's the second.