First, I would advice you to fully read this interesting FAQ post below, which explains to prefer the use of a JSON parser ( instead of regexes ) for such problems :

https://community.notepad-plus-plus.org/topic/25304/faq-parsing-and-editing-json-with-regex-is-a-bad-idea/1?lang=fr

Oh,…, by moving to your post, I just see the @mark-olson’s reply which explains a straight solution, based on the JsonTools plugin ;-))

However, I also succeeded to find out a regex way to do it !

So, given your INPUT text, below, in a new tab :

"water": {
    "DisplayName": "Water",
    "Skin": 0,
    "Image": "water.png",
    "DefaultAmount": 1,
    "BlockAmountChange": false,
    "BuyPrice": 5000,
    "SellPrice": 0,
    "Currency": "eco"
  },
  "healingtea.advanced": {
    "DisplayName": "default",
    "Skin": 0,
    "Image": "healingtea.advanced.png",
    "DefaultAmount": 1,
    "BlockAmountChange": false,
    "BuyPrice": 500,
    "SellPrice": 0,
    "Currency": "eco"
  },

• Open the Replace dialog ( Ctrl + H )

• Untick all box options

• SEARCH (?-is)^\x20+"Image":\x20"\K

• REPLACE https://www.example\.com/example2/

• Check the Wrap around option

• Click, once, on the Replace All button ( NOT the Replace button ! )

You should get this OUTPUT text :

"water": {
    "DisplayName": "Water",
    "Skin": 0,
    "Image": "https://www.example.com/example2/water.png",
    "DefaultAmount": 1,
    "BlockAmountChange": false,
    "BuyPrice": 5000,
    "SellPrice": 0,
    "Currency": "eco"
  },
  "healingtea.advanced": {
    "DisplayName": "default",
    "Skin": 0,
    "Image": "https://www.example.com/example2/healingtea.advanced.png",
    "DefaultAmount": 1,
    "BlockAmountChange": false,
    "BuyPrice": 500,
    "SellPrice": 0,
    "Currency": "eco"
  },

Now with the following regex S/R, we’ll change any dot character, not followed by the string png", at end of line, with a dash char :

SEARCH (?-si)(?:^\x20+"Image":\x20"https://www.example.com/example2/|(?!\A)\G).*?\K\.(?!png",$)

REPLACE -

Just follow, exactly, the same other points of the previous S/R !

You should get your expected OUTPUT text :

"water": {
    "DisplayName": "Water",
    "Skin": 0,
    "Image": "https://www.example.com/example2/water.png",
    "DefaultAmount": 1,
    "BlockAmountChange": false,
    "BuyPrice": 5000,
    "SellPrice": 0,
    "Currency": "eco"
  },
  "healingtea.advanced": {
    "DisplayName": "default",
    "Skin": 0,
    "Image": "https://www.example.com/example2/healingtea-advanced.png",
    "DefaultAmount": 1,
    "BlockAmountChange": false,
    "BuyPrice": 500,
    "SellPrice": 0,
    "Currency": "eco"
  },

BR

guy038

This is the kind of job that you don’t want to use regular expressions for; JSON can be very hard to parse with regex. Use a JSON parser instead.

If I understand your goal correctly, your JSON document is an object that has many instances of the following:

    "this.is_the.key": {
        "BlockAmountChange": (true or false),
        "BuyPrice": (integer),
        "Currency": (text),
        "DefaultAmount": (integer),
        "DisplayName": (text),
        "Image": (text),
        "SellPrice": (integer),
        "Skin": (integer)
    }

and you want to modify every one of these objects to the following:

    "this.is_the.key": {
        "BlockAmountChange": (true or false),
        "BuyPrice": (integer),
        "Currency": (text),
        "DefaultAmount": (integer),
        "DisplayName": (text),
        "Image": "https://www.example.com/example2/this-is_the-key.png",
        "SellPrice": (integer),
        "Skin": (integer)
    }

There are many ways to do this, including with scripting plugins like PythonScript. I’m going to demonstrate how to do this with the JsonTools plugin using RemesPath. If you need to automate this procedure, I recommend learning Python, and using the steps below as a starting point for your Python script that does this.

1. Copy the text of your file into a new buffer so that you can compare the result to the original
2. Open the tree view in JsonTools in your new buffer
3. Paste the following query in the text box at the top of the tree view

   for x = keys(@);
   at(@, x).Image = `https://www.example.com/example2/` + s_sub(x, `.`, `-`) + `.png`
   

4. Click the Submit query button; this will change every Image field
5. You can use ComparePlus to compare the result with the original and make sure it’s to your liking.

I tested this query with the following START JSON:

{
    "3kkQI.k67920": {
        "BlockAmountChange": false,
        "BuyPrice": -708951,
        "Currency": "DBg0",
        "DefaultAmount": -618002,
        "DisplayName": "default",
        "Image": "PAC",
        "SellPrice": -191929,
        "Skin": 439298
    },
    "ruHOa": {
        "BlockAmountChange": false,
        "BuyPrice": 800735,
        "Currency": "7",
        "DefaultAmount": 92053,
        "DisplayName": "8G",
        "Image": "cDf.Sdw",
        "SellPrice": 434145,
        "Skin": -127422
    },
    "Eup8FI8t.bvBR_JZcEv.YHBfpk": {
        "BlockAmountChange": true,
        "BuyPrice": 74371,
        "Currency": "KD",
        "DefaultAmount": 687624,
        "DisplayName": "I8v",
        "Image": "I3JGDMP.QUxCfddTP",
        "SellPrice": 94973,
        "Skin": -40263
    },
    "water": {
        "DisplayName": "Water",
        "Skin": 0,
        "Image": "water.png",
        "DefaultAmount": 1,
        "BlockAmountChange": false,
        "BuyPrice": 5000,
        "SellPrice": 0,
        "Currency": "eco"
    },
    "healingtea.advanced": {
        "DisplayName": "default",
        "Skin": 0,
        "Image": "healingtea.advanced.png",
        "DefaultAmount": 1,
        "BlockAmountChange": false,
        "BuyPrice": 500,
        "SellPrice": 0,
        "Currency": "eco"
    }
}

and got this END JSON:

{
    "3kkQI.k67920": {
        "BlockAmountChange": false,
        "BuyPrice": -708951,
        "Currency": "DBg0",
        "DefaultAmount": -618002,
        "DisplayName": "default",
        "Image": "https://www.example.com/example2/3kkQI-k67920.png",
        "SellPrice": -191929,
        "Skin": 439298
    },
    "ruHOa": {
        "BlockAmountChange": false,
        "BuyPrice": 800735,
        "Currency": "7",
        "DefaultAmount": 92053,
        "DisplayName": "8G",
        "Image": "https://www.example.com/example2/ruHOa.png",
        "SellPrice": 434145,
        "Skin": -127422
    },
    "Eup8FI8t.bvBR_JZcEv.YHBfpk": {
        "BlockAmountChange": true,
        "BuyPrice": 74371,
        "Currency": "KD",
        "DefaultAmount": 687624,
        "DisplayName": "I8v",
        "Image": "https://www.example.com/example2/Eup8FI8t-bvBR_JZcEv-YHBfpk.png",
        "SellPrice": 94973,
        "Skin": -40263
    },
    "water": {
        "DisplayName": "Water",
        "Skin": 0,
        "Image": "https://www.example.com/example2/water.png",
        "DefaultAmount": 1,
        "BlockAmountChange": false,
        "BuyPrice": 5000,
        "SellPrice": 0,
        "Currency": "eco"
    },
    "healingtea.advanced": {
        "DisplayName": "default",
        "Skin": 0,
        "Image": "https://www.example.com/example2/healingtea-advanced.png",
        "DefaultAmount": 1,
        "BlockAmountChange": false,
        "BuyPrice": 500,
        "SellPrice": 0,
        "Currency": "eco"
    }
}