How to use Regex to return a directory from TM_FILEPATH in vscode user snippets?

Question

I am looking for a way to create a user snippet to grab the core directory from a project. Here is the sample path that I am using:

C:dev/Pseudope/Unreal/Cubicle/Source/CubicleCore/Private

When creating vscode snippets ${TM_FILEPATH} will return this path to be used along side a regular expression. I want to be able to use these snippets for different projects that will all have the same structure as the filepath above where the text that I want to apply to the snippet will always be nested between Source and Private|Public. Here is the regex that I have so far:

(?<=Source\\)(.*)(?=\\Private|Public)

According to https://regexr.com/ this expression will target the value "CubicleCore" as well as group it into group 1. Unfortunately, there seems to be a disconnect between the regular expression in the browser and how vscode is interpreting it because the result I get is:

UE_LOG(Log${TM_FILEPATH/(?<=Source\)(.*)(?=\Private|Public)/}, Log, TEXT("Hello");

When it should be:

UE_LOG(LogCubicleCore, Log, TEXT("Hello");

Any help/direction would be greatly appreciated.

Wiktor Stribiżew · Accepted Answer · 2021-01-26 18:17:22Z

1

You can use

"UE_LOG(Log${TM_FILEPATH/.*Source[\\\\\\/]([^\\\\/]+)[\\\\\\/](?:Private|Public).*/$1/}, Log, TEXT(\"Hello\")"

See the regex demo.

Details:

.* - any zero or more chars as many as possible
Source - Source
[\\\/] - / or \
([^\\\/]+) - Group 1 ($1): any one or more chars other than \ and /
[\\\/] - a / or \ char
(?:Private|Public) - Private or Public string
.* - any zero or more chars as many as possible.

answered Jan 26, 2021 at 18:17

Wiktor Stribiżew

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2 Comments

Pseuplex Over a year ago

Thank you for the quick response. I appreciate the detailed explanation. Not only does this solve my question (I already tested in vscode) but it also provided a deeper understanding of regex thanks!

Wiktor Stribiżew Over a year ago

@Pseudope I should have mentioned that in the ${TM_FILEPATH/pattern/replacement/flags} you need to use the repalcement logic (you used a matching one), and you also need to double escape backslashes to form regex escapes, otherwise they are simply ignored if not part of valid string escape sequences.

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