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10e1579799
BSD grep does not interpret a null alteration. It complains about an empty sub-expression, e.g.: $ grep --version && grep -E '^(# |)CT_' .config grep (BSD grep) 2.5.1-FreeBSD grep: empty (sub)expression This patch replaces the null alteration with a zero or once quantifier which works with both BSD & GNU grep. $ grep --version && grep -E '^(# )?CT_' .config grep (BSD grep) 2.5.1-FreeBSD CT_CONFIGURE_has_xz=y CT_CONFIGURE_has_svn=y ... $ ggrep --version && ggrep -E '^(# )?CT_' .config ggrep (GNU grep) 2.20 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Written by Mike Haertel and others, see <http://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS>. CT_CONFIGURE_has_xz=y CT_CONFIGURE_has_svn=y ... Signed-off-by: Jason T. Masker <jason@masker.net> Tested-by: Andreas Bießmann <andreas@biessmann.de> Signed-off-by: Bryan Hundven <bryanhundven@gmail.com>