• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Expected behavior

I'm not certain where is the problem but docker is happy to build images based on Windows ServerCore from my Dockerfile,
so I'd expect the linter accepts the EXPOSE port range specification in it (Dockerfile below):

${APP_PORT}-${APP_PORT_MAX}/tcp

Actual behavior

bash-5.1# hadolint --no-fail --no-color test/Dockerfile 
test/Dockerfile:23:13 unexpected '$' expecting '`', a new line followed by the next instruction, or the variable name

I understand the line ${APP_PORT}-${APP_PORT_MAX}/tcp in this bit

EXPOSE `
${APP_PORT}/tcp `
${APP_PORT}-${APP_PORT_MAX}/tcp

can be a bit unusual specification of port range, but Docker is fine about.

Simplifying it this way does not help:

EXPOSE ${APP_PORT}/tcp ${APP_PORT}-${APP_PORT_MAX}/tcp

Steps to reproduce the behavior

Output of hadolint --version or
docker run --rm hadolint/hadolint hadolint --version or
docker run --rm ghcr.io/hadolint/hadolint hadolint --version:

# hadolint --version
Haskell Dockerfile Linter 2.10.0

Dockerfile (if relevant)

# escape=`
ARG BASE_IMAGE
ARG BASE_IMAGE_TAG

FROM ${BASE_IMAGE}:${BASE_IMAGE_TAG}
ARG ENTRYPOINT
ARG APP_VERSION
ENV APP_VERSION=${APP_VERSION}
WORKDIR /
COPY `
${ENTRYPOINT} `
scripts\app.ps1 `
./

ENV `
APP_PATH=C:\app.ps1 `
APP_PORT=4330 `
APP_PORT_MAX=4340

EXPOSE `
${APP_PORT}/tcp `
${APP_PORT}-${APP_PORT_MAX}/tcp

VOLUME ["D:", "Z:"]

ENTRYPOINT ["powershell.exe", "-NoProfile", "-ExecutionPolicy", "Bypass", "C:\\appps1;"]