Pattern Rewriter

Professional pattern rewriter tool for restructuring templates, logs, code patterns, and text formats using customizable transformation rules.

Pattern Rewriter

Transform text using customizable patterns and templates. Perfect for restructuring logs, code, and data formats.

Input Pattern (Regex)

(\S+)\s+-\s+-\s+\[([^\]]+)\]\s+"([^"]+)"\s+(\d+)\s+(\d+)

Output Template

{"ip": "$1", "timestamp": "$2", "request": "$3", "status": $4, "size": $5}

Add Custom Pattern

Create your own transformation patterns using regular expressions.

Transformed Result

Text transformed using the selected pattern.

{"ip": "192.168.1.1", "timestamp": "25/Dec/2023:10:00:00 +0000", "request": "GET /api/users HTTP/1.1", "status": 200, "size": 1234}
{"ip": "127.0.0.1", "timestamp": "25/Dec/2023:10:01:00 +0000", "request": "POST /api/login HTTP/1.1", "status": 201, "size": 567}

About Pattern Rewriting

Pattern rewriting is a powerful text transformation technique that allows you to restructure and reformat text based on predefined patterns and templates. This tool helps you convert between different formats, standardize log entries, transform code structures, and create consistent templates.

Pattern Types

  • Log Formats: Apache, Nginx, application logs
  • Code Templates: Function signatures, class structures
  • Data Formats: CSV, JSON, XML transformations
  • Document Templates: Reports, forms, letters
  • URL Patterns: Rewrite rules, redirects
  • Configuration Files: Environment configs, settings
  • Database Schemas: Table structures, queries
  • API Responses: Response formatting, structure

Use Cases

  • Log file standardization and analysis
  • Code refactoring and migration
  • Data format conversion and cleaning
  • Template generation and customization
  • Configuration file transformation
  • API response restructuring
  • Documentation generation
  • Report formatting and standardization

Pattern Rewriting Examples

Log Format Transformation

Input Pattern:
192.168.1.1 - - [25/Dec/2023:10:00:00 +0000] "GET /api/users HTTP/1.1" 200 1234
Output Template:
{timestamp: "2023-12-25T10:00:00Z", ip: "192.168.1.1", method: "GET", path: "/api/users", status: 200, size: 1234}

Code Structure Transformation

Input Pattern:
function getUserById(id) {return users.find(u => u.id === id)}
Output Template:

Data Format Conversion

Input Pattern (CSV):
John,Doe,30,Engineer
Output Template (JSON):
{"firstName": "John", "lastName": "Doe", "age": 30, "profession": "Engineer"}

URL Rewrite Rules

Input Pattern:
/product.php?id=123&category=electronics
Output Template:
/products/electronics/123

Advanced Pattern Features

Capture Groups and Variables

Use capture groups to extract specific parts of your input text and reuse them in your output template. Variables can be defined for complex transformations and conditional logic.

Pattern: /user/([^/]+)/profile/([^/]+)
Template: /api/v2/users/$1/profiles/$2
Result: /user/john/profile/settings → /api/v2/users/john/profiles/settings

Conditional Transformations

Apply different transformation rules based on conditions. Create complex logic for handling various input scenarios and edge cases.

Condition-based Rules

if (status === "200") {format = "success"}
else {format = "error"}

Multiple Templates

Pattern A → Template 1
Pattern B → Template 2
Default → Template 3