A regular expression (regex or regexp) is a sequence of characters that defines a search pattern. Regex is used to find, match, extract, or replace text based on patterns rather than exact strings.

How do I extract all email addresses from text?

Use the pattern [a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,} with the Extract matches mode and the g (global) flag. This matches standard email address formats.

Regex Match Extractor & Replacer - Free Online Regex Tool

Using the Regular Expression Tool for Text Extraction

Input your regex pattern and select your desired flags.
Choose a mode: Extract matches, Extract groups, or Replace.
Paste the text you want to process into the input field.
Click Run to see your results formatted according to your selected mode.

Regex Match Extractor & Replacer: test, extract, and transform text instantly with our versatile regex tool. Designed for developers and data analysts, this utility allows you to extract capture groups or perform complex find-and-replace operations using standard regular expression syntax. By processing all data locally in your browser, the tool ensures maximum performance and complete privacy for your sensitive datasets.

Advanced Regex Replacer and Pattern Matching Tool

Our generator provides a clean interface for an online regex debugger, helping you verify and refine your patterns before using them in your code. Whether you need a regex find and replace utility for log files or a pattern matching tool for data cleanup, our software delivers immediate results. The tool handles multiple modes, from simple line-matching tests to detailed capture group extraction, making it an essential part of any text processing workflow. Use it to streamline your text transformation tasks with technical precision and speed.

Extraction of all matching substrings or specific capture groups
Robust regex replacer with support for backreferences ($1, $2, etc.)
Live feedback and clear error reporting from the native regex engine
Browser-side execution for zero-latency text processing

Frequently Asked Questions

What does regex-tools do?

regex-tools test regex, extract matches and capture groups, and replace text.

What input does regex-tools accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes - every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Optimize your text processing today with this high-performance utility. Explore more Text tools at Chunky Munster and keep this Regex Match Extractor & Replacer bookmarked for all your regular expression needs.

Regex Match Extractor & Replacer online

Test regex, extract matches and capture groups, and replace text - runs in your browser