Development
Python Regex Tester (re module)
Test Python re patterns online: (?P<name>…) named groups, (?P=name) backreferences, VERBOSE patterns, findall behavior, and \g<name> replace templates — plus ready-to-paste Python code.
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Quick start
Call this tool from your code in three languages.
cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/python-regex-tester' \
-H 'Content-Type: application/json' \
-d '{"pattern":"(?P<first>\\w+)\\s+(?P<last>\\w+)","subject":"Ada Lovelace, Grace Hopper","flag_i":false,"flag_m":false,"flag_s":false,"flag_x":false,"flag_a":false,"flag_g":true,"replacement":"\\g<last>, \\g<first>","unicodeClasses":true}'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/python-regex-testerParameters
| Name | Type | Required | Description |
|---|---|---|---|
| pattern | text | Yes | — |
| subject | textarea | No | — |
| flag_i | checkbox | No | — |
| flag_m | checkbox | No | — |
| flag_s | checkbox | No | — |
| flag_x |
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-python-regex-tester": {
"name": "python-regex-tester",
"description": "Test Python re patterns online: (?P<name>…) named groups, (?P=name) backreferences, VERBOSE patterns, findall behavior, and \\g<name> replace templates — plus ready-to-paste Python code.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=python-regex-tester",
"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": "python-regex-tester",
"arguments": {
"pattern": "(?P<first>\\w+)\\s+(?P<last>\\w+)",
"subject": "Ada Lovelace, Grace Hopper",
"flag_i": false,
"flag_m": false,
"flag_s": false,
"flag_x": false,
"flag_a": false,
"flag_g": true,
"replacement": "\\g<last>, \\g<first>",
"unicodeClasses": true
}
}
}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).