awk: FS regex matches only non-empty separators (gawk compat)

function                                             old     new   delta
awk_split                                            484     553     +69

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/testsuite/awk.tests b/testsuite/awk.tests
index 87f6b5007..06a531d96 100755
--- a/testsuite/awk.tests
+++ b/testsuite/awk.tests
@@ -398,5 +398,12 @@ testing 'awk do not allow "str"++' \
         '' \
         'anything'
 
+#gawk compat: FS regex matches only non-empty separators:
+#with -*, the splitting is NOT f o o b a r, but foo bar:
+testing 'awk FS regex which can match empty string' \
+        "awk -F '-*' '{print \$1 \"-\" \$2 \"=\" \$3 \"*\" \$4}'" \
+        "foo-bar=*\n" \
+        '' \
+        'foo--bar'
 
 exit $FAILCOUNT