Is there a way to use regex expression in vscode snippet prefix?

Question

I read the document and it seems that regex expression is only used in snippet body.

Answer 1

Regex's can only be used to transform snippet variables in the body of the snippet, but you can put multiple snippet prefixes like this:

"stripLastDirectory": {
  "prefix": ["lsd", "lsf", "lsq"],
   "body": [
      "${TM_DIRECTORY/.*[\\\\|\\/]+(.*)/$1/}"
  ],
}, 

So perhaps you can accomplish what you need that way.

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Another alternative with some pluses (can use javascript within the snippet!) and minuses (no support for vscode variables like ${file}) is the extension HyperSnips which does allow you to use pure regex for snippet "prefixes".