Change QUIC uses of gmock regex to simpler syntax

This fixes Chromium test failures because on some platforms gmock does not support bracket syntax like [0-9]

gfe-relnote: n/a, test-only
PiperOrigin-RevId: 254031357
Change-Id: Icc25b58afaaf0970fc0a78de936d52db3f433a05

quic/core/http/quic_spdy_session_test.cc

diff --git a/quic/core/http/quic_spdy_session_test.cc b/quic/core/http/quic_spdy_session_test.cc
index 5b926db..919a4fe 100644
--- a/quic/core/http/quic_spdy_session_test.cc
+++ b/quic/core/http/quic_spdy_session_test.cc
@@ -1589,12 +1589,12 @@
         .Times(1);
   } else {
     // On version 99 opening such a stream results in a connection close.
-    EXPECT_CALL(*connection_,
-                CloseConnection(
-                    QUIC_INVALID_STREAM_ID,
-                    testing::MatchesRegex(
-                        "Stream id [0-9]+ would exceed stream count limit 6"),
-                    _));
+    EXPECT_CALL(
+        *connection_,
+        CloseConnection(QUIC_INVALID_STREAM_ID,
+                        testing::MatchesRegex(
+                            "Stream id \\d+ would exceed stream count limit 6"),
+                        _));
   }
   // Create one more data streams to exceed limit of open stream.
   QuicStreamFrame data1(kFinalStreamId, false, 0, QuicStringPiece("HT"));

quic/core/http/quic_spdy_stream_test.cc

diff --git a/quic/core/http/quic_spdy_stream_test.cc b/quic/core/http/quic_spdy_stream_test.cc
index 63d5ba3..a1e4fab 100644
--- a/quic/core/http/quic_spdy_stream_test.cc
+++ b/quic/core/http/quic_spdy_stream_test.cc
@@ -262,10 +262,10 @@
   if (version_uses_qpack) {
     EXPECT_CALL(
         *connection_,
-        CloseConnection(QUIC_HEADERS_STREAM_DATA_DECOMPRESS_FAILURE,
-                        testing::MatchesRegex(
-                            "Too large headers received on stream [0-9]+"),
-                        _));
+        CloseConnection(
+            QUIC_HEADERS_STREAM_DATA_DECOMPRESS_FAILURE,
+            testing::MatchesRegex("Too large headers received on stream \\d+"),
+            _));
   } else {
     EXPECT_CALL(*session_,
                 SendRstStream(stream_->id(), QUIC_HEADERS_TOO_LARGE, 0));
@@ -1796,7 +1796,7 @@
       *connection_,
       CloseConnection(QUIC_DECOMPRESSION_FAILURE,
                       testing::MatchesRegex(
-                          "Error decompressing header block on stream [0-9]+: "
+                          "Error decompressing header block on stream \\d+: "
                           "Incomplete header block."),
                       _))
       .WillOnce(