"VSCode：替换文本做数学"

Question

I want to replace numbers with some math calc based on the numbers.

For example, I have the following text

...
foo 1 42 3
bar 4 5 67
...

Using Ctrl+f tool with the regex (.+) ([\\d]+) ([\\d]+) ([\\d]+) , I already can use the values with $1 , $2 , $3 ... But I need some way to, for example, sum the values.

If I use a replace regex like Total $1: $2 + $3 + $4 , I get:

...
Total foo: 1 + 42 + 3
Total bar: 4 + 5 + 67
...

but actually I want

...
Total foo: 46
Total bar: 76
...

Actually, I don't know if it is possible.

Answer 1

Math in regex replace in vscode is not possible (yet?)

There is an open issue in vscode's github: https://github.com/Microsoft/vscode/issues/2902

Answer 2

I wrote an extension that can do this pretty easily: Find and Transform .

So for the OP's question, you could use this keybinding (in keybindings.json ):

{
  "key": "alt+m",                     // whatever keybinding you want
  "command": "findInCurrentFile",
  "args": {
    "find": "(.+) (\\d+) (\\d+) (\\d+)",
    "replace": "$${ `Total $1: ` + ($2 + $3 + $4) }",
    "isRegex": true,

    // "restrictFind": "document"  // or line, selections, once
  }
},

Or you can set that up as a command in your settings.json . See the Readme.

$${ `Total $1: ` + ($2 + $3 + $4) }  

will perform a javascript operation. In this case using $1 as part of a string (delimited by backticks) and adding $2, $3 and $4 as Numbers. Demo: