Development

Regex Replace Previewer

Preview regex replacements in real-time with detailed diff highlights and statistics

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/regex-replace-previewer' \
  -H 'Content-Type: application/json' \
  -d '{"textInput":"Enter the text you want to process...","pattern":"e.g., \\b(\\d{4})-(\\d{2})-(\\d{2})\\b","replacement":"e.g., $2/$3/$1","flags":"g","previewMode":"side-by-side"}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/regex-replace-previewer

Parameters

Name	Type	Required	Description
textInput	textarea	Yes	—
pattern	text	Yes	Enter the regular expression pattern to search for
replacement	text	Yes	Use $1, $2, ${name} for capture groups. Special: $& (match), $` (prefix), $' (suffix), $$ (literal $)
flags	text	No	Regex flags: g (global), i (case-insensitive), m (multiline), etc.
previewMode	select	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-regex-replace-previewer": {
      "name": "regex-replace-previewer",
      "description": "Preview regex replacements in real-time with detailed diff highlights and statistics",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=regex-replace-previewer",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "regex-replace-previewer",
    "arguments": {
  "textInput": "Enter the text you want to process...",
  "pattern": "e.g., \\b(\\d{4})-(\\d{2})-(\\d{2})\\b",
  "replacement": "e.g., $2/$3/$1",
  "flags": "g",
  "previewMode": "side-by-side"
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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