Vscode snippet: tranform filename to Capitalize sentence with a regex

Question

I want to tranform filename-with-dashes.md to Filename with dashes in a Vscode snippet

To be precise, I want to populate the field "title" in this snippet, from a filename similar to firt-post-ever.md and get First post ever:

"FrontMatter": {
    "scope": "markdown",
    "prefix": "frontmatter",
    "body": [
        "---",
        "title: '${TM_FILENAME_BASE/^([^-]*)-([^.]*).*/${1:/pascalcase} ${2:/capitalize}/}'",
        "draft: true",
[...]

What I have so far:

This regex changes filename-with-dashes.md to Filename with-dashes (← I still need to remove the dashes in the end):

${TM_FILENAME_BASE/^([^-]*)-([^.]*).*/${1:/pascalcase} ${2:/downcase}/}

Resources I checked:

• https://code.visualstudio.com/docs/editor/userdefinedsnippets#_grammar
• vscode snippet - multiple regex transformation filepath+filename
• VSCode Keybinding Snippet: Use TM_SELECTED_TEXT to Remove All Slashes From A Selected String
• VSCode chaining regex transforms in a snippet
• Transform and regex in Code Snippets in VSCode - Docs

Unfortunately, these pages wasn't enough to find a proper answer (I can't understand the regex syntax, despite heavy effort I can't get it..) Any hint?

Notes:

• only the first letter of the whole title must be uppercase
• the filename may contain dots (example: notes-for-dev.to-update-2022.md).
  In such case only the file extension must be stripped

Answer 1

Here is a snippet that works:

"FrontMatter": {
    "scope": "markdown",
    "prefix": "frontmatter",
    "body": [
        "---",
        
        "title: '${TM_FILENAME_BASE/(^\\w*)|(-)/${1:/pascalcase}${2:+ }/g}'",
        
        // if other words might have caps you don't want

        "title: '${TM_FILENAME_BASE/(^\\w+)|(\\w+)|(-)/${1:/pascalcase}${3:+ }${2:/downcase}/g}'",
        
        "draft: true"
    ]
}

(^\\w+) get the first "word" in capture group 1
(\\w+) get the any other words in capture group 2
(-) get any - in capture group 3.

${1:/pascalcase} Capitalize the first letter of the first word and lowercase the rest of the letters of the first word.

${3:+ } If there is a group 3, add a space - thus replacing any -'s with spaces.