[PATCH v1] perf test: Replace grep perl regexp with awk

[Chun-Tse Shao <ctshao@google.com>]

perl is not universal on all machines and should be replaced with awk,
which is much more common.

Before:
  $ perf test "probe libc's inet_pton & backtrace it with ping" -v
  --- start ---
  test child forked, pid 145431
  grep: Perl matching not supported in a --disable-perl-regexp build

  FAIL: could not add event
  ---- end(-1) ----
  121: probe libc's inet_pton & backtrace it with ping                 : FAILED!
After:
  $ perf test "probe libc's inet_pton & backtrace it with ping" -v
  121: probe libc's inet_pton & backtrace it with ping                 : Ok

Suggested-by: Ian Rogers <irogers@google.com>
Signed-off-by: Chun-Tse Shao <ctshao@google.com>
---
 tools/perf/tests/shell/record+probe_libc_inet_pton.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
index c4bab5b5cc59..aaa5ee06ae18 100755
--- a/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
+++ b/tools/perf/tests/shell/record+probe_libc_inet_pton.sh
@@ -23,7 +23,8 @@ event_pattern='probe_libc:inet_pton(\_[[:digit:]]+)?'
 add_libc_inet_pton_event() {

 	event_name=$(perf probe -f -x $libc -a inet_pton 2>&1 | tail -n +2 | head -n -5 | \
-			grep -P -o "$event_pattern(?=[[:space:]]\(on inet_pton in $libc\))")
+			awk -v ep="$event_pattern" -v l="$libc" '$0 ~ ep && $0 ~ \
+			("\\(on inet_pton in " l "\\)") {print $1}')

 	if [ $? -ne 0 ] || [ -z "$event_name" ] ; then
 		printf "FAIL: could not add event\n"
--
2.50.0.rc2.701.gf1e915cc24-goog