services: use RE2/J

RE2/J ensures linear time matching, and as such is preferred over `java.util.regex` for safety in the mono repo. While currently safe, this conversion future-proofs any `Pattern`s in BinlogHelper, and removes the need to maintain an exception for gRPC wrt. use of regexes.

2 files changed, 3 insertions, 2 deletions

diff --git a/services/build.gradle b/services/build.gradle
index f9c34337d..b865cd55e 100644
--- a/services/build.gradle
+++ b/services/build.gradle
@@ -20,6 +20,7 @@ dependencies {
         // prefer 20.0 from libraries instead of 19.0
         exclude group: 'com.google.guava', module: 'guava'
     }
+    compile libraries.re2j
 
     compileOnly libraries.javax_annotation
     testCompile project(':grpc-testing'),
diff --git a/services/src/main/java/io/grpc/services/BinlogHelper.java b/services/src/main/java/io/grpc/services/BinlogHelper.java
index 1d8d1443f..727208453 100644
--- a/services/src/main/java/io/grpc/services/BinlogHelper.java
+++ b/services/src/main/java/io/grpc/services/BinlogHelper.java
@@ -22,6 +22,8 @@ import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Splitter;
 import com.google.protobuf.ByteString;
+import com.google.re2j.Matcher;
+import com.google.re2j.Pattern;
 import io.grpc.Attributes;
 import io.grpc.BinaryLog.CallId;
 import io.grpc.CallOptions;
@@ -60,8 +62,6 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.logging.Level;
 import java.util.logging.Logger;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;