Reject near-matching level codes before they enter a game
The practical problem
A level-code parser can accidentally accept a prefix of malicious or malformed input if its regular expression does not match the full string.
Implementation protocol
Define a bounded grammar, normalize consistently and use full-string matching. Reject leading spaces, embedded newlines and extra suffixes unless the grammar explicitly permits them.
Worked scenario
For the format L- followed by three digits, accept L-007 but reject L-007-extra, empty input and a thousand-character copy-paste.
What could go wrong
Blindly stripping invalid characters may silently transform a different code into a valid one.
Acceptance criteria
Test exact, near-valid and oversized cases with safe error display.
Source material and evidence boundaries
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