Regex Benchmark

Compare performance of different regex patterns, identify bottlenecks, and detect degenerate cases

## Regex Performance Benchmarking Tool This tool helps you: - **Compare multiple regex patterns** to find the fastest one - **Identify performance bottlenecks** in your regular expressions - **Detect degenerate cases** that cause catastrophic backtracking - **Get optimization recommendations** for better performance ## Features - Accurate timing with warmup phase for JIT optimization - Statistical analysis (avg, min, max, median) - Performance tier classification (fast/medium/slow/very-slow) - Automatic detection of common anti-patterns - Degenerate case testing for edge cases ## Usage 1. Enter multiple regex patterns (one per line) 2. Provide test input strings (one per line) 3. Set iterations and warmup runs 4. Choose regex flags (e.g., 'gi', 'm') 5. Run benchmark to compare performance ## Performance Tips - Use non-capturing groups `(?:...)` instead of capturing groups - Avoid nested quantifiers like `(.*)+` - Use atomic groups `(?>...)` or possessive quantifiers to prevent backtracking - Be specific with character classes instead of `.\*` - Anchor patterns with `^` and `$` when possible

API Documentation

Request Endpoint

POST /en/api/tools/regex-benchmark

Request Parameters

Parameter Name	Type	Required	Description
regexList	textarea	Yes	-
testInput	textarea	Yes	-
regexFlags	text	No	-
iterations	number	No	-
warmupRuns	number	No	-
targetDialect	select	Yes	-
includeDegenerate	checkbox	No	-

Response Format

{
  "key": {...},
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}

JSON Data: JSON Data

AI MCP Documentation

Add this tool to your MCP server configuration:

{
  "mcpServers": {
    "elysiatools-regex-benchmark": {
      "name": "regex-benchmark",
      "description": "Compare performance of different regex patterns, identify bottlenecks, and detect degenerate cases",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=regex-benchmark",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]