I am trying to make a snippet that will take clipboard contents (the text of a heading in a markdown document) and transform it into a link to that section. For example, if my clipboard contains: Some Heading - 20191107 then I want the following to be output:

[Some Heading - 20191107](filename.md#some-heading---20191107)

Here is my snippet VS Code for markdown so far:

"link to this section": {
        "prefix": "isection",
        "body": [
            "[${1:${CLIPBOARD}}](${TM_FILENAME}#${CLIPBOARD/ /-/g})"
        ],
        "description": "Insert link to section whose heading text is in the clipboard"
    }

This has the first transform, but what I cannot figure out is how to nest multiple transforms:

• Replace all space with a hyphen.
• Change all to lower case.
• Remove any characters matching [^a-z0-9-]

Test Case

To clarify my test case for @Mark, in a markdown document in VS Code, I make a section heading such as:

# 20191107 - @#$%^& This is a section - 20191107

I then copy the text 20191107 - @#$%^& This is a section - 20191107 and run the snippet you fixed up for me. What it outputs is:

[20191107 - @#$%^& This is a section - 20191107](tips.tech.git.md#20191107----this-is-a-section---20191107)

Which is a valid link to the heading!