# Regex

Browse 24 online regex tools for working with regular expressions and regexp data. Use them in your browser without installing software.

> Canonical page: https://elysiatools.com/en/tags/regex

## Overview

Explore 24 tools for working with regex, regular expressions, and regexp data through a browser-based interface. Processing runs on Elysia Tools servers; text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

## Frequently asked questions

### What can I do with Regex tools?

You can work with regex, regular expression, and regexp data using the tools available in this category, without installing software.

### How is my data handled?

You operate the tools through your browser, while processing runs on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

### Do I need to install software to use these Regex tools?

No. The tools are available through the browser interface, so no software installation is required.

## Tools

- [AI Regex Explainer](https://elysiatools.com/en/tools/ai-regex-explainer): Use AI to break down regular expressions into readable explanations
- [BGP Community Regex Tester and Looking-Glass Explainer](https://elysiatools.com/en/tools/bgp-community-string-regex-tester-and-looking-glass): Validate RFC 8294 BGP community regex patterns against a set of communities, match sample AS-paths, and generate Cisco/Juniper/FRR route-policy output.
- [Bulk Email Extractor](https://elysiatools.com/en/tools/bulk-email-extractor): Extract all email addresses from input text, articles, web source code, or mixed content. Supports deduplication and export to JSON.
- [Glob to Regex](https://elysiatools.com/en/tools/glob-to-regex): Convert file matching patterns (Glob) to regular expressions
- [Log Parser - Apache/Nginx Access Log Parser](https://elysiatools.com/en/tools/log-parser): Parse Apache/Nginx access logs using regex patterns and extract structured data
- [Multi-Pattern Matcher](https://elysiatools.com/en/tools/multi-pattern-matcher): Match multiple regex patterns against text in one operation
- [Named Group Tester](https://elysiatools.com/en/tools/named-group-tester): Parse and display named capture groups from regex patterns
- [ReDoS (Regular Expression Denial of Service) Scanner](https://elysiatools.com/en/tools/redos-regex-scanner): Scan one or more regex patterns for catastrophic backtracking risk, simulate evil inputs, and suggest safer rewrites
- [Regex Benchmark](https://elysiatools.com/en/tools/regex-benchmark): Compare performance of different regex patterns, identify bottlenecks, and detect degenerate cases
- [Regex Cheat Sheet](https://elysiatools.com/en/tools/regex-cheat-sheet): A searchable, localized cheat sheet for regular expression syntax — character classes, anchors, quantifiers, groups & references, lookarounds, escape sequences, and flags — with a built-in quick tester
- [Regex Debugger](https://elysiatools.com/en/tools/regex-debugger): Step through how a regular expression matches a string position by position: visualize match attempts, partial successes, backtracks, and captures — a learning tool for understanding regex behavior, not just the final result
- [Regex Linter](https://elysiatools.com/en/tools/regex-linter): Detect error-prone and risky regex patterns, check for catastrophic backtracking, unanchored patterns, and provide rewrite suggestions
- [Regex Railroad Diagram Visualizer](https://elysiatools.com/en/tools/regex-railroad-diagram-visualizer): Render a regular expression as an SVG railroad (syntax) diagram showing literals, groups, alternations, and repetition, with capture-group numbering and flag explanations
- [Regex Replace Previewer](https://elysiatools.com/en/tools/regex-replace-previewer): Preview regex replacements in real-time with detailed diff highlights and statistics
- [Regex Tester](https://elysiatools.com/en/tools/regex-tester): Test regular expressions against text
- [Regex to String Generator](https://elysiatools.com/en/tools/regex-to-string-generator): Generate random strings that match a given regular expression pattern
- [Test Data Faker Builder](https://elysiatools.com/en/tools/test-data-faker-builder): Generate structured test data from field configuration with support for faker fields, regex rules, credit cards, IDs, and batch export
- [Text File Replacer](https://elysiatools.com/en/tools/text-file-replacer): Find and replace text in files with support for regex, multiple patterns, and backup creation
- [Text File Searcher](https://elysiatools.com/en/tools/text-file-searcher): Search for text patterns in files with advanced options (regex, case-sensitive, whole word, etc.)
- [Filter Text Lines](https://elysiatools.com/en/tools/text-line-filter): Quickly return text lines that match a pattern or a regex
- [Filter Text Paragraphs](https://elysiatools.com/en/tools/text-paragraph-filter): Quickly return all paragraphs that match a pattern or a regex
- [Text Pattern Stats](https://elysiatools.com/en/tools/text-pattern-stats): Statistics and frequency analysis of text patterns (numbers, emails, URLs, etc.)
- [Filter Text Sentences](https://elysiatools.com/en/tools/text-sentence-filter): Quickly return all sentences that match a pattern or a regex
- [Filter Words in Text](https://elysiatools.com/en/tools/text-word-filter): Quickly return words in text that match a pattern or a regex

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