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Yes, that's the problem. You need to maintain a close attention level to know which things are POSIX. And in the case of GNU grep, you actually need to set POSI
by burntsushi 3y ago
Yes, that's the problem. You need to maintain a close attention level to know which things are POSIX. And in the case of GNU grep, you actually need to set POSIXLY_CORRECT=1. Otherwise its behavior is not a subset.
POSIX also forbids greps from searching UTF-16 because it mandates that certain characters always use a single byte. ripgrep, for example, doesn't have this constraint and thus can transparently search UTF-16 correctly via BOM sniffing.