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Regex generator

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Regex generator

Derive a regular expression from example strings and check it against counter-examples.

Input

Fill in the fields below, then run the tool.

Examples to match

Counter-examples

Anchor the pattern, ^ and $

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

Result

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About this tool

Derive a regular expression from example strings and check it against counter-examples.

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IEEE 754 explorer

Decompose a float into sign, exponent and mantissa, with neighbours, ULP and round-trip error.

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Chmod calculator

Convert an octal or symbolic file mode into numeric, symbolic and special-bit forms.

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Diff and patch generator

Produce a unified diff between two texts with configurable context and an optional patch header.

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ООО «Арбрерус» · ИНН 9705159935 · ОГРН 1217700466752 · Registered office: 143960, Moscow Oblast, Reutov, 5a Gagarina St., room 56 · contact@arbrerus.ru

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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
BSON Hex Converter Data processing
CSV Data Viewer Data processing
CSV to JSON converter Data processing
CSV to Markdown Data processing
CSV to SQL Data processing
CSV validator Data processing
Diff checker Data processing
ER Diagram Generator Data processing
GraphQL Formatter Data processing
Gzip Tools Data processing
HTML entities encoder Data processing
HTML to Text Data processing
JSON Validator & Formatter Data processing
JSON Schema Builder Data processing
JSON Schema validator Data processing
JSON to CSV converter Data processing
JSON to XML converter Data processing
JSON ⇄ YAML converter Data processing
JSON5 Validator Data processing
JSON Lines Converter Data processing
JSONPath tester Data processing
Remove duplicate lines Data processing
NoSQL Validator Data processing
Number base converter Data processing
SOAP Formatter Data processing
SQL Performance Analyzer Data processing
SQL Formatter Data processing
Temperature Converter Data processing
Timestamp converter Data processing
Timezone Converter Data processing
TOML to JSON Data processing
TOML validator Data processing
URL encoder / decoder Data processing
WSDL Formatter Data processing
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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Checksum Calculator Security
CORS Policy Builder Security
CORS Response Validator Security
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
Bandwidth calculator Network & API
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
MX lookup Network & API
Network info Network & API
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Port reference Network & API
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URL parser Network & API
Redirect chain checker Network & API
User-Agent parser Network & API
WebSocket frame parser Network & API
WHOIS lookup Network & API
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Unit converter Development utilities
Compound Interest Calculator Finance
Loan and Mortgage Calculator Finance
Tip and Bill Splitter Finance
SMD Resistor Code Decoder Device & sensors
GPA and Grade Calculator Education & science
Kitchen Unit Converter Everyday
Biorhythm Calculator Health
BMR and TDEE Calculator Health
Pregnancy Due Date Calculator Health
Sleep Cycle Calculator Health

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