Describe how other systems treat this case.
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@ -438,7 +438,11 @@ u2/g' lines1
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# This is a matter of interpretation
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# POSIX 1003.1, 2004 says "Within the BRE and the replacement,
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# the BRE delimiter itself can be used as a *literal* character
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# if it is preceded by a backslash
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# if it is preceded by a backslash"
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# SunOS 5.1 /usr/bin/sed and Mac OS X follow the literal POSIX
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# interpretation.
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# GNU sed version 4.1.5 treats \[ as the beginning of a character
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# set specification (both with --posix and without).
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mark '8.19' ; sed 's/l/[/' lines1 | $SED -e 's[\[.[X['
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mark '8.20' ; sed 's/l/[/' lines1 | $SED -e 's[\[.[X\[['
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}
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