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APCA contrast calculator
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Border radius generator
Box shadow generator
PX to REM converter

Palindrome checker
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Ed25519 key pair generator
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HMAC generator
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JWT Validator
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SQL Injection Detector
SSH Key Pair Generator
Text Encryptor
Random Token Generator
TOTP Generator

Bandwidth calculator
curl to code
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Redirect chain checker
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WebSocket frame parser
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Compound Interest Calculator
Loan and Mortgage Calculator
Tip and Bill Splitter

SMD Resistor Code Decoder

GPA and Grade Calculator

Kitchen Unit Converter

Biorhythm Calculator
BMR and TDEE Calculator
Pregnancy Due Date Calculator
Sleep Cycle Calculator

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Text analysis
Regex tester

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Regex tester

Test a regular expression with flags, inspect matches and capture groups, and preview a replacement.

Input

Fill in the fields below, then run the tool.

Pattern

Text

Replacement

Ignore case

Multiline, ^ and $ match line breaks

Dot matches newlines

Processed on the server and never stored. Press Ctrl/⌘ + Enter to run.

Result

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About this tool

Test a regular expression with flags, inspect matches and capture groups, and preview a replacement.

Related tools

Palindrome checker

Check whether a word or sentence reads the same forwards and backwards.

Binary text translator

Convert text to binary digits and back, in bytes or nibbles.

Text case converter

Convert text to UPPER, lower, Title, Sentence, camelCase, snake_case, kebab-case and more.

Character frequency counter

Count characters, words or bigrams and rank them by frequency.

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Version 0.1.0

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APCA contrast calculator Color
Colour blindness simulator Color
Colour contrast checker Color
Color converter Color
Colour mixer Color
Colour name finder Color
Colour shades generator Color
CSS gradient generator Color
OKLCH colour converter Color
Random palette generator Color
Aspect ratio calculator Design
Border radius generator Design
Box shadow generator Design
PX to REM converter Design
Base64 toolbox Data processing
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CSV Data Viewer Data processing
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CSV to Markdown Data processing
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XML Validator & Formatter Data processing
XML to JSON converter Data processing
YAML to TOML Data processing
YAML Validator & Formatter Data processing
Palindrome checker Text analysis
Binary text translator Text analysis
Text case converter Text analysis
Character frequency counter Text analysis
Find and replace Text analysis
HTML to Markdown Text analysis
Keyword extractor Text analysis
Markdown formatter Text analysis
Markdown linter Text analysis
Markdown to HTML Text analysis
Markdown to plain text Text analysis
Readability score Text analysis
Regex explainer Text analysis
Regex tester Text analysis
ROT13 and Caesar cipher Text analysis
String escape and unescape Text analysis
Subtitle tools Text analysis
Trim lines Text analysis
Sort lines Text analysis
Word counter Text analysis
Unicode inspector Text analysis
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CORS Policy Builder Security
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Credit Card Validator Security
CSP Header Builder Security
CSR Decoder Security
ECDSA key pair generator Security
Ed25519 key pair generator Security
Email Address Validator Security
EXIF Metadata Stripper Security
File Encryptor (AES) Security
Hash Comparison Security
Hash generator Security
HMAC generator Security
JWT Decoder Security
JWT Signer Security
JWT Validator Security
Password generator Security
Password strength checker Security
PEM Certificate Inspector Security
RSA key pair generator Security
security.txt Generator Security
SQL Injection Detector Security
SSH Key Pair Generator Security
Text Encryptor Security
Random Token Generator Security
TOTP Generator Security
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curl to code Network & API
DNS lookup Network & API
Email header analyzer Network & API
HTTP header builder Network & API
HTTP header parser Network & API
IPv6 expander Network & API
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Port reference Network & API
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