URL parser, regex tester, timestamps, cron validator, IP subnet calculator, and dev helpers.
Test regular expressions with real-time match highlighting, flags, and capture groups.
Deconstruct and explain regular expression tokens, quantifiers, and groups in plain English.
Deconstruct URLs into protocol, host, port, path, query parameters, and hash fragment.
Parse query strings into key-value pairs or construct URL-encoded parameter strings.
Validate IPv4 and IPv6 addresses and classify as public, private, or loopback.
Calculate network IP, broadcast IP, netmask, wildcard mask, and usable host count from CIDR.
Generate standard localhost and local development test URLs with ports and routes.
Convert standard IPv4 addresses to IPv4-mapped IPv6, 6to4, and hex formats.
Validate MAC addresses and reformat between colon, hyphen, and dot-separated notation.
Generate standard BIND-style DNS zone records for A, AAAA, CNAME, MX, TXT, and SPF.
Convert Unix epoch timestamps (seconds & ms) to UTC, ISO 8601, and local dates.
Convert numeric Unix timestamps into multiple human-readable date formats.
Convert any date and time into Unix timestamps in seconds and milliseconds.
Convert time between major world timezones (UTC, EST, PST, GMT, IST, JST, CET).
Parse 5-field cron expressions and calculate upcoming execution schedules.
Translate complex cron expressions into clear human-readable sentences.
Format and beautify HTML, CSS, JavaScript, JSON, and SQL in one interface.
Generate placeholder Lorem Ipsum paragraphs, sentences, and words.
Generate mock user names, email addresses, phone numbers, UUIDs, and addresses.
Validate UUID strings and identify version (v1, v3, v4, v5) and variant.
Generate Microsoft Windows GUIDs with braces, registry format, and uppercase options.
Parse and format SNMP and ASN.1 Object Identifiers (OID dot notation).
Turn any title or text string into a clean, URL-safe SEO slug.
Generate random integers or floats within custom min/max ranges (with unique flag).
Generate random alphanumeric strings, API keys, and test tokens.
Look up HTTP response status codes (1xx, 2xx, 3xx, 4xx, 5xx) with descriptions and specs.
Find MIME types by file extension or file extensions by Content-Type header.
Decode and inspect PEM-encoded X.509 certificates (subject, issuer, validity, SANs).
Parse browser User-Agent strings to extract browser name, version, OS, and device type.
Calculate Linux chmod permissions between numeric octal (755, 644) and symbolic (rwxr-xr-x).
What Is a Unix Timestamp?
A unix timestamp counts seconds since 1970. Here is what epoch time measures, why it has no time zone, and how to convert a timestamp to a date correctly.
Regex Lookahead and Lookbehind Made Simple
Regex lookahead and lookbehind explained with working examples: password rules, price extraction, thousands separators, and which engines actually support them.
Regex for Beginners: Your First Ten Patterns
A regex tutorial for beginners built around ten patterns you will actually reuse — word search, validation, dates, phone numbers, URLs, and duplicate words.
Regex Character Classes and Quantifiers Explained
How regex character classes and quantifiers really work: ranges, negation, \d \w \s across engines, Unicode classes, and every repetition form with its gotchas.
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