Regex convert to uppercase in VSVim

Question

I'm currently using :s/(-[a-z].*-)([a-z])/$1\U$2/., however this just deletes the character after the 2nd - instead of converting it to an uppercase variant?

I have a CSS file and I have several entries in the form of, ql-font-timesnewroman, ql-font-arial, ql-font-geneva, etc. I want to convert them to ql-font-Timesnewroman, ql-font-Arial, ql-font-Geneva, etc.

I am using VSVim with VSCode, and I am not sure which version of Regex it uses (but I believe it is the Javascript variant).

If I use the PHP variant, it works fine. (https://regex101.com/r/8aZI2m/1)

But if I use the Javascript variant, it just sticks a U into the result: ql-font-Utimesnewroman.

In VSCode, it goes a step further and just inserts \U instead. (ql-font-\Utimesnewroman).

If I change the regex to look more like, :s/(-[a-z].*-)([a-z])/$1/\U$2/., it just goes ahead and erases the 2nd match instead of converting it to uppercase (ql-font-imesnewroman)

Is there any special syntax that VSVim / VSCode needs for its regex to match and replace with an uppercase correctly?

Answer 1

vscode v1.47 is adding support for the find/replace case modifiers like \u, etc. See https://stackoverflow.com/a/62270300/836330

In your case you could use this as the replace:

 $1\u$2   // \u as you are only capitalizing a single letter

[I am not familiar with VSVIM so tell us if s/(-[a-z].*-)([a-z])/$1\u$2/. works for you.]

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Older Answer:

Try this keybinding in keybindings.json, which inserts a snippet so that you can use a transform:

 {
    "key": "alt+b",              // whatever keybinding you wish
    "command": "editor.action.insertSnippet",
    "args": {
      "snippet": "${TM_SELECTED_TEXT/-font-(\\w+)/-font-${1:/capitalize}/g}""
    },
  },

You select your text first and then trigger the snippet.

This will work for :

ql-font-timesnewroman
// unrelated text here can be selected to and it will be unaffected.**
ql-font-arial

ql-font-timesnewroman, ql-font-arial, ql-font-geneva  // all in one line

If your selection includes unrelated text, it will be unchanged UNLESS it matches the -font-(\\w+) regex used by the snippet - which seems generally unlikely.

If you have a lot of these in a file and you are uncomfortable selecting the whole file and applying this transform, then Find first with the -font-(\w+) regex (note no need to double-escape the \w in the Find widget but you must use \\w in a snippet!) and Alt+Enter will select all matches and then you can trigger the snippet.