Github user ottobackwards commented on a diff in the pull request:
https://github.com/apache/metron/pull/638#discussion_r126778367
--- Diff:
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/dsl/functions/RegExFunctions.java
---
@@ -0,0 +1,103 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.metron.stellar.dsl.functions;
+
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.apache.metron.stellar.common.utils.ConversionUtils;
+import org.apache.metron.stellar.common.utils.PatternCache;
+import org.apache.metron.stellar.dsl.BaseStellarFunction;
+import org.apache.metron.stellar.dsl.Stellar;
+
+public class RegExFunctions {
+
+ @Stellar(name = "REGEXP_MATCH",
+ description = "Determines whether a regex matches a string",
+ params = {
+ "string - The string to test",
+ "pattern - The proposed regex pattern"
+ },
+ returns = "True if the regex pattern matches the string and false if
otherwise.")
+ public static class RegexpMatch extends BaseStellarFunction {
+
+ @Override
+ public Object apply(List<Object> list) {
+ if (list.size() < 2) {
+ throw new IllegalStateException(
+ "REGEXP_MATCH expects two args: [string, pattern] where
pattern is a regexp pattern");
+ }
+ String patternString = (String) list.get(1);
+ String str = (String) list.get(0);
+ if (str == null || patternString == null) {
+ return false;
+ }
+ return
PatternCache.INSTANCE.getPattern(patternString).matcher(str).matches();
+ }
+ }
+
+ @Stellar(name = "REGEXP_GROUP_VAL",
+ description = "Returns the value of a group in a regex against a
string",
+ params = {
+ "string - The string to test",
+ "pattern - The proposed regex pattern",
+ "group - integer that selects what group to select, starting at
1"
+ },
+ returns = "The value of the group, or null if not matched or no
group at index")
+ public static class RegexpGroupValue extends BaseStellarFunction {
+
+ @Override
+ public Object apply(List<Object> list) {
+ if (list.size() < 3) {
--- End diff --
Addressed, good catch
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