Localization Placeholder Checker — illustrative example

INPUT
Source: Hello, {name}. You have {count} messages. Translation: Bonjour, {name}. Vous avez des messages.

RESULT
Preserved placeholder: {name}.
Missing placeholder: {count}.
Return the string for correction and validate the restored variable with the application's message format.

REVIEW
Placeholder checks should compare identifiers and structural syntax, not just visible sentences. A missing variable can break the interface even when the translated prose reads naturally.

This is a teaching example, not a live execution record.