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Regex Replace Tool
Text Engine
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Regex Replace & String Substitution Tool

Perform regular expression search and replace operations on text online. Supports capture groups, substitution tokens ($1, $2), and regex flags.

Regex pattern matching with flags
Capture group substitutions ($1, $2)
Instant live replacement
Copy & Download
Step-by-Step Guide

How to Use Regex Replace Tool Online

Follow these quick steps to process your data online directly in your browser with zero latency and 100% privacy.

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Step 1Enter your search regular expression pattern and replacement string in the toolbar, or load a pre-built preset.
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Step 2Set active regex flags (global, case-insensitive, multiline, dotAll, unicode) and use replacement tokens ($1, $2, $&).
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Step 3Review the live replaced output text and replacement count, then copy or download the result with one click.
Demonstration

Example Input & Output

Replaces matched patterns with custom formatted replacement tokens.

Source Text to Transform
User ID: 12345, Order ID: 67890
Replaced Text Output
user_12345, order_67890
Applications

Common Use Cases

Data Cleaning & Refactoring

Reformat phone numbers, dates, IDs, and code syntax across large text files.

Knowledge

Frequently Asked Questions

How to search and replace using regex online?

Enter your regex pattern and replacement string in the toolbar above; the source text is updated immediately in real time.

How do I use capture groups in regex replace?

Use parentheses (pattern) to create groups, then reference them as $1, $2 in the replacement string.

Workflow

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