01 / SetupCLI
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regex-engine / quantifiersFoundation, not solution
Stage 03 — Quantifiers
A star doesn't stop on its own.
In Quantifiers, +One or more of the atom before it. ab+c matches abc and abbc, never ac.MDN + quantifier → means one or more, *Zero or more of the atom before it. ab*c matches ac, abc, and abbc.MDN * quantifier → means zero or more, and ?Zero or one of the atom before it. ab?c matches ac and abc, not abbc.MDN ? quantifier → means zero or one. A greedy match takes every character it can, then backtracksGives characters back, one at a time, when the rest of the pattern fails.NFA matching → until the rest fits. shipcode test --stage quantifiers expects matched true and span [2, 7] for pattern ab+c? and text xxabbbczz.
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P-01Beta
Build your own MCP server
Build an MCP server from scratch. Implement Model Context Protocol with JSON-RPC, tools and resources to connect AI clients to your programs.
TypeScriptPythonGo
P-02Beta
Build your own neural network
Build a neural network from scratch. Implement the forward pass, loss functions and gradient descent, then train and run your own model.
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P-03Beta
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Build SHA-256 and HMAC from scratch. Implement rotations, padding and compression blocks, then sign and verify messages without a crypto library.
CPythonGo
P-04Beta
Build your own regex engine
Build a regex engine from scratch. Turn expressions into automata with backtracking, groups and character classes without using a regex library.
TypeScriptPythonRust
P-05Coming soon
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P-06Coming soon
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TypeScriptPythonGo
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Yes. All published content, starters, the CLI, and saved progress are available without paying. Pro is $8 USD/month and Max is $15 USD/month; both include cloud tests, the mentor, and a public profile with different allowances.
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