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Common Prefix Regex Optimizer

Generate optimized regular expression patterns from strings by consolidating common prefixes.

Input Strings

Delimiter
Please benchmark for your specific use case. Sets or even arrays can often be faster.

Features

  • Flexible Input: Parse strings with newline, space, comma, or custom delimiters
  • Prefix Optimization: Generate compact regex patterns by consolidating common prefixes
  • Multiple Pattern Styles: Choose between optimized (prefix-consolidated) or simple alternation
  • Regex Options: Configure capture groups, flags (global, case-insensitive, multiline)

Use Cases

  • URL Route Matching: Generate patterns for similar API routes (/api/users, /api/posts, /api/comments)
  • Keyword Detection: Build patterns from programming language names or other keyword lists
  • Command Parsing: Match CLI command variations (--help, --version, --verbose)
  • Domain Filtering: Create patterns for related domains (example.com, example.org, example.net)
  • File Extensions: Match multiple file types (.js, .jsx, .ts, .tsx)

How It Works

1. Parse Input

Enter or paste your strings, separated by your chosen delimiter:

apple
application
apply

2. Consolidate Common Prefixes

The tool identifies and consolidates common prefixes:

app
├── le (*)
├── lication (*)
└── ly (*)

3. Generate Regex

Two pattern generation modes:

Optimized (Prefix-consolidated):

regex
/app(?:l(?:e|ication)|ly)/g

Simple Alternation:

regex
/apple|application|apply/g