grokdebugger.com

This client-side application uses WebAssembly to run PCRE RegEx in the browser. It can help you debug your Grok patterns.

Features:

• Real-time processing (see changes as you type)
• Autocomplete
• Match highlighting
• Syntax highlighting
• Multiline debugging
• A dozen pattern sets (Grok, firewalls, Java, HAProxy, etc.)
• Save patterns and load them later (uses browser localstorage)