Replace deprecated CharMatcher method

CharMatcher.isLetterOrDigit() is deprecated for failing to support
supplementary characters. We explicitly declare a matcher for ascii
letters and digits.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=252671830

java/google/registry/util/JavaCharMatchers.java

@@ -0,0 +1,33 @@
+// Copyright 2019 The Nomulus Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package google.registry.util;
+
+import com.google.common.base.CharMatcher;
+
+/**
+ * Creates {@link CharMatcher CharMatchers} that support Java character strings only, not unicode
+ * supplementary characters.
+ */
+public class JavaCharMatchers {
+
+  /** Returns a {@link CharMatcher} that matcher only ASCII letters and digits. */
+  public static CharMatcher asciiLetterOrDigitMatcher() {
+    return CharMatcher.inRange('0', '9')
+        .or(CharMatcher.inRange('a', 'z'))
+        .or(CharMatcher.inRange('A', 'Z'));
+  }
+
+  private JavaCharMatchers() {}
+}

java/google/registry/util/RegistrarUtils.java

@@ -14,15 +14,19 @@
 
 package google.registry.util;
 
-import static com.google.common.base.CharMatcher.javaLetterOrDigit;
 
 import com.google.common.base.Ascii;
+import com.google.common.base.CharMatcher;
 
 /** Utilities for working with {@code Registrar} objects. */
 public class RegistrarUtils {
+
+  private static final CharMatcher ASCII_LETTER_OR_DIGIT_MATCHER =
+      JavaCharMatchers.asciiLetterOrDigitMatcher();
+
   /** Strip out anything that isn't a letter or digit, and lowercase. */
   public static String normalizeRegistrarName(String name) {
-    return Ascii.toLowerCase(javaLetterOrDigit().retainFrom(name));
+    return Ascii.toLowerCase(ASCII_LETTER_OR_DIGIT_MATCHER.retainFrom(name));
   }
 
   /**

java/google/registry/util/SqlTemplate.java

@@ -38,7 +38,7 @@ public final class SqlTemplate {
       Pattern.compile("(['\"]?)%(" + KEY_PATTERN + ")%(['\"]?)");
 
   private static final CharMatcher LEGAL_SUBSTITUTIONS =
-      CharMatcher.javaLetterOrDigit().or(CharMatcher.anyOf("-_.,: "));
+      JavaCharMatchers.asciiLetterOrDigitMatcher().or(CharMatcher.anyOf("-_.,: "));
 
   /** Returns a new immutable SQL template builder object, for query parameter substitution. */
   public static SqlTemplate create(String template) {