t5540-http-push.sh: avoid non-portable grep -P

OS X's GNU grep does not support -P/--perl-regexp.

We use a basic RE instead, and simplify the pattern slightly by
replacing '+' with '*' so it can be more easily expressed using a basic
RE.  The important part of pattern, checking for a SHA-1 has suffix in
the successful PUT/MOVE operations, remains the same.  Also, a-z instead
of a-f was an obvious mistake in the original RE. Here are samples of
what we want to match:

127.0.0.1 - - [26/Feb/2009:22:38:13 +0000] "PUT /test_repo.git/objects/3e/a4fbb9e18a401a6463c595d08118fcb9fb7426_fab55116904c665a95438bcc78521444a7db6096 HTTP/1.1" 201 277
127.0.0.1 - - [26/Feb/2009:22:38:13 +0000] "MOVE /test_repo.git/objects/3e/a4fbb9e18a401a6463c595d08118fcb9fb7426_fab55116904c665a95438bcc78521444a7db6096 HTTP/1.1" 201 277

Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5540-http-push.sh

@@ -94,10 +94,15 @@ test_expect_success 'MKCOL sends directory names with trailing slashes' '
 
 '
 
-test_expect_success 'PUT and MOVE sends object to URLs with SHA-1 hash suffix' '
+x1="[0-9a-f]"
+x2="$x1$x1"
+x5="$x1$x1$x1$x1$x1"
+x38="$x5$x5$x5$x5$x5$x5$x5$x1$x1$x1"
+x40="$x38$x2"
 
-	grep -P "\"(?:PUT|MOVE) .+objects/[\da-z]{2}/[\da-z]{38}_[\da-z\-]{40} HTTP/[0-9.]+\" 20\d" \
-		< "$HTTPD_ROOT_PATH"/access.log
+test_expect_success 'PUT and MOVE sends object to URLs with SHA-1 hash suffix' '
+	sed -e "s/PUT /OP /" -e "s/MOVE /OP /" "$HTTPD_ROOT_PATH"/access.log |
+	grep -e "\"OP .*/objects/$x2/${x38}_$x40 HTTP/[.0-9]*\" 20[0-9] "
 
 '