Development
Step through how a regular expression matches a string position by position: visualize match attempts, partial successes, backtracks, and captures — a learning tool for understanding regex behavior, not just the final result
Call this tool from your code in three languages.
curl -X POST 'https://api.elysiatools.com/en/api/tools/regex-debugger' \
-H 'Content-Type: application/json' \
-d '{"pattern":"\\d+","flags":"g","testText":"Order 42 ships in 7 days"}'Send a POST request with your inputs as JSON. File parameters require a separate upload first.
POST https://api.elysiatools.com/en/api/tools/regex-debugger| Name | Type | Required | Description |
|---|---|---|---|
| pattern | text | No | — |
| flags | text | No | — |
| testText | textarea | No | — |
Interactive result
{
"result": "Initial display content",
"interactive": true,
"components": [
{
"type": "timer",
"id": "timer1",
"config": {
"label": "Countdown",
"duration": 60
}
}
],
"state": {
"key": "value"
},
"actions": [
{
"type": "start",
"id": "start-btn",
"label": "Start"
}
],
"styles": "/* Custom CSS */",
"scripts": "/* Client-side scripts */",
"error": "Error message (optional)",
"message": "Notification message (optional)",
"metadata": {
"key": "value"
}
}Add this tool to your Model Context Protocol server so AI agents can list and call it.
Add this block to your MCP client configuration:
{
"mcpServers": {
"elysiatools-regex-debugger": {
"name": "regex-debugger",
"description": "Step through how a regular expression matches a string position by position: visualize match attempts, partial successes, backtracks, and captures — a learning tool for understanding regex behavior, not just the final result",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=regex-debugger",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Invoke the tool by its id, passing arguments built from its parameters:
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "regex-debugger",
"arguments": {
"pattern": "\\d+",
"flags": "g",
"testText": "Order 42 ships in 7 days"
}
}
}Questions or issues? Contact [email protected]