sieve.y: tweak validation of template variables - #6248
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make sure syntax is correct and 'body' extension is required
Parse the index with strtoul and require a non-zero value closed with "]$". A reference that does not parse is now emitted literally instead of being expanded.
Cover the compile-time validation: a $text$ reference without the "body" extension, an unterminated "$text[", a zero index, and a non-numeric index are all rejected, while a well-formed reference still compiles. Co-Authored-By: Claude <claude@anthropic.com>
ksmurchison
approved these changes
Aug 14, 2026
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