Cheat Sheets
Dense, practical references designed for daily lookup. Each sheet fits on one page when printed, links to the live tool for trying patterns, and covers the syntax you actually use — not every obscure edge case. Free, no signup, printable.
Regex Cheat Sheet — Complete Reference (PCRE, JavaScript, Python)
Complete regular expression cheat sheet with every anchor, character class, quantifier, group, and flag — plus 30+ ready-to-use patterns for emails, URLs, dates, and more.
HTTP Status Codes Cheat Sheet — All 70+ Codes Explained
Complete HTTP status code reference with all 1xx, 2xx, 3xx, 4xx, 5xx codes, when to use each, common causes, and practical examples. Bookmark for debugging.
Markdown Cheat Sheet — Complete Syntax Guide (GFM + CommonMark)
Full Markdown syntax reference: headings, emphasis, lists, links, images, tables, code blocks, task lists, footnotes, and all GitHub Flavored Markdown extensions. Free, bookmarkable.
Need the tool, not the reference?
Most cheat sheets link straight to an interactive tool — test regexes, decode JWTs, format markdown — right in your browser.
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