Apicurio Registry's three prompt renderers use different regex engines, causing inconsistent output

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A technical analysis of Apicurio Registry's main branch reveals that a single stored PROMPT_TEMPLATE artifact is processed by three independent code surfaces: a REST renderer, an MCP converter, and a write-time validator. Each component uses its own regular expression to parse template variables, meaning they do not share a common rendering engine or call one another. As a result, a template like '{{ name }}' with added whitespace, dots, or conditional blocks can produce three different outputs from the same stored content. For example, the REST renderer trims whitespace and accepts loose syntax, while the validator applies a stricter pattern that may not recognise the same variables. Developers building UI playgrounds or new clients on top of prompt rendering must identify which of the three surfaces their code actually targets to avoid inconsistent results.

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