[Bug]: Fail to capture the preceding part of the backslash in resource functions

[Nuvindu]

Description

When using resource methods in Ballerina services, it seems that the preceding part of the backslash in the resource path is not being properly captured.

Steps to Reproduce

Run the following code.

public client class Client {

    resource function get v1\.2/greeting() returns string {
        return "Hello World!";
    }
}

public function main() {
    Client clientEP = new;
    string greeting = clientEP->/v1\.2/greeting;
    io:println(greeting);
}

The error output as follows

error: No such method: 1$accounts$^$users$^$signatures
        at nuvindu.docuSign.0:main(main.bal:9)

[LakshanWeerasinghe]

For now you can have a work around for this,

  resource function get ["v1.2"]/greeting() returns string {
        return "Hello World!";
    }

[github-actions]

This issue is NOT closed with a proper Reason/ label. Make sure to add proper reason label before closing. Please add or leave a comment with the proper reason label now.

      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.