Tiny Online Tools
Advanced Find & Replace with Regex Patterns
Find and replace is essential for refactoring and text 変換ation, but simple string replacement is limited. You can't easily replace all variations of a pattern, rearrange matched content, or conditionally replace based on context. Manual find-and-replace in an editor is slow for complex changes. This Regex Replace Tool lets you define patterns and see replacements instantly before applying them.
Write a regex pattern, specify a replacement using capture groups, and watch the 変換ation happen in real time. Perfect for bulk code refactoring, data 変換ation, and complex text processing.
Powerful Replacement Syntax
Literal Replacement: Simply replace all matches with fixed text.
Capture Group References: Use $1, $2, etc. to reference captured groups, rearranging matched content:
- Pattern:
(\\w+)\\s+(\\w+)(first and last name) - Replacement:
$2, $1(last name, first name) - Example: "John Smith" → "Smith, John"
Special Replacements:
$&: The entire matched string$`` : Text before the match$': Text after the match
Common Code Refactoring Scenarios
Rename Variables Across Files: Find all instances of a variable pattern and rename them. For example, change user_id to userId everywhere:
- Pattern:
user_id - Replacement:
userId
For complex patterns like function_name( that vary:
- Pattern:
(\\w+_\\w+)\\( - Replacement: Use a pattern to extract and 変換 the name
Reフォーマット Data: 変換 data フォーマットs without manual editing. 変換 date フォーマットs, phone numbers, or address フォーマットs by extracting parts and recombining them:
- Pattern:
(\\d{4})-(\\d{2})-(\\d{2})(YYYY-MM-DD) - Replacement:
$3/$2/$1(DD/MM/YYYY)
Code Modernization: Update code syntax across files. For example, update import statements, function signatures, or API calls:
- Old:
require('module') - New:
import 'module'
HTML/XML 変換ation: Restructure or update markup by finding patterns and rewriting them with rearranged content.
Log Cleanup: Remove or 変換 sensitive data in logs. Find email addresses, phone numbers, or IDs and replace them with redacted versions:
- Pattern:
\\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Z|a-z]{2,}\\b - Replacement:
[REDACTED]
Live Preview Before Applying
See the 変換ation in real time. This is crucial—test your pattern and replacement on a sample before applying to entire documents. Mistakes in find-and-replace can corrupt large files quickly.
Full Regex Flag Support
- g (global): Replace all matches, not just the first
- i (case-insensitive): Replace regardless of case
- m (multiline): Treat line boundaries as match anchors
- s (dotAll): Dot matches newlines
Copy & Use Results
Once satisfied with the 変換ation, copy the result to your クリップボード and paste it directly into your editor or files.
100% ローカル処理
All find-and-replace happens in your ブラウザ. Your content never leaves your machine, making this safe for proprietary code, sensitive data, or internal documentation.