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2.5.1 only the last one is honored: > echo "foonbar" | egrep -e 'foo' -e 'bar' bar > echo "foonbar" | egrep -e 'bar' -e 'foo' foo Reported by Nicolas Joly. An alternative would have to use `sed', unfortunately alternation is not portable. * tests/actest.m4 (join): New macro. (AC_ENV_SAVE): Join the egrep patterns into a single big one. * tests/Makefile.am (EGREP_EXCLUDE): Rename as FILTER_MACROS. Join the egrep patterns into a single big one.