Signed-off-by: Ramsay Jones <ram...@ramsay1.demon.co.uk>
---
 .gitignore             |  1 +
 Makefile               |  1 +
 t/t0070-fundamental.sh |  5 +++++
 test-regex.c           | 20 ++++++++++++++++++++
 4 files changed, 27 insertions(+)
 create mode 100644 test-regex.c

diff --git a/.gitignore b/.gitignore
index bb5c91e..68fe464 100644
--- a/.gitignore
+++ b/.gitignore
@@ -189,6 +189,7 @@
 /test-mktemp
 /test-parse-options
 /test-path-utils
+/test-regex
 /test-revision-walking
 /test-run-command
 /test-sha1
diff --git a/Makefile b/Makefile
index 6b0c961..3b760d3 100644
--- a/Makefile
+++ b/Makefile
@@ -496,6 +496,7 @@ TEST_PROGRAMS_NEED_X += test-mergesort
 TEST_PROGRAMS_NEED_X += test-mktemp
 TEST_PROGRAMS_NEED_X += test-parse-options
 TEST_PROGRAMS_NEED_X += test-path-utils
+TEST_PROGRAMS_NEED_X += test-regex
 TEST_PROGRAMS_NEED_X += test-revision-walking
 TEST_PROGRAMS_NEED_X += test-run-command
 TEST_PROGRAMS_NEED_X += test-scrap-cache-tree
diff --git a/t/t0070-fundamental.sh b/t/t0070-fundamental.sh
index 9bee8bf..da2c504 100755
--- a/t/t0070-fundamental.sh
+++ b/t/t0070-fundamental.sh
@@ -25,4 +25,9 @@ test_expect_success POSIXPERM 'mktemp to unwritable directory 
prints filename' '
        grep "cannotwrite/test" err
 '
 
+test_expect_success 'check for a bug in the regex routines' '
+       # if this test fails, re-build git with NO_REGEX=1
+       test-regex
+'
+
 test_done
diff --git a/test-regex.c b/test-regex.c
new file mode 100644
index 0000000..b5bfd54
--- /dev/null
+++ b/test-regex.c
@@ -0,0 +1,20 @@
+#include <git-compat-util.h>
+
+int main(int argc, char **argv)
+{
+       char *pat = "[^={} \t]+";
+       char *str = "={}\nfred";
+       regex_t r;
+       regmatch_t m[1];
+
+       if (regcomp(&r, pat, REG_EXTENDED | REG_NEWLINE))
+               die("failed regcomp() for pattern '%s'", pat);
+       if (regexec(&r, str, 1, m, 0))
+               die("no match of pattern '%s' to string '%s'", pat, str);
+
+       /* http://sourceware.org/bugzilla/show_bug.cgi?id=3957  */
+       if (m[0].rm_so == 3) /* matches '\n' when it should not */
+               die("regex bug confirmed: re-build git with NO_REGEX=1");
+
+       exit(0);
+}
-- 
1.7.12

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