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POSIX mode incorrectly rejects i\(text) format #252
Description
Rust (incorrect - returns error)
$ echo "test" | cargo run --quiet -- -n --posix -e 'i\(text'
# Error: sed: <script argument 1>:1:3: error: extra characters after \ at the end of `i' command
# Exit code: 1
GNU (correct)
$ echo "test" | /usr/bin/sed -n --posix -e 'i\(text'
# Output: (text
# Exit code: 0
Bug Found by Fuzzer
Activity
e-kwsm commentedon Jan 18, 2026
POSIX requires newline, i.e.
is the valid syntax;
i\(textis a GNU extension, and BSD rejects it:e-kwsm commentedon Jan 18, 2026
duplicate of #144.
LoukasPap commentedon Feb 9, 2026
Hello. Should this issue be considered close?