Gist tell me if it looks like Markdown

LooksLikeMarkdown.ps1

filter looksLikeMarkdown {
    if (
        # If it's got a markdown-like link
        $_ -match '\[[^\]]+\]\(' -or 
        # Or any of the lines start with markdown special characters
        $_ -split '(?>\r\n|\n)' -match '\s{0,3}[\#*~`]'
    ) {
        # it's probably markdown
        $_
    }    
}

# does not look like markdown
"hello" | looksLikeMarkdown
# does not look like markdown
"<h1>hello world</h1>" | looksLikeMarkdown


# Everything from here on down looks like markdown
"[hello world](https://example.com)" | looksLikeMarkdown
"# hello world" | looksLikeMarkdown
"* one thing" | looksLikeMarkdown
"~~~PowerShell
'hello world'
~~~" | looksLikeMarkdown