SOLR-10291: Add match Stream Evaluator to support regex matching

solr/solrj/src/java/org/apache/solr/client/solrj/io/Lang.java

@@ -289,6 +289,7 @@ public class Lang {
         .withFunctionName("recNum", RecNumEvaluator.class)
         .withFunctionName("notNull", NotNullEvaluator.class)
         .withFunctionName("isNull", IsNullEvaluator.class)
+        .withFunctionName("matches", MatchesEvaluator.class)
 
         // Boolean Stream Evaluators
 

solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/MatchesEvaluator.java

@@ -0,0 +1,61 @@
+/*
+ * 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.solr.client.solrj.io.eval;
+
+import java.io.IOException;
+import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
+import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
+
+public class MatchesEvaluator extends RecursiveBooleanEvaluator implements ManyValueWorker {
+  protected static final long serialVersionUID = 1L;
+  private Pattern pattern;
+
+  public MatchesEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{
+    super(expression, factory);
+
+    if(containedEvaluators.size() != 2){
+      throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting two parameters but found %d",expression,containedEvaluators.size()));
+    }
+  }
+
+  public Object doWork(Object[] values) throws IOException {
+    if(values[1] instanceof String) {
+      String s = values[0].toString();
+      if(pattern == null) {
+        String p = (String) values[1];
+        pattern = Pattern.compile(p.replace("\"", ""));
+      }
+
+      if(s.startsWith("\"")) {
+        s = s.replace("\"", "");
+      }
+
+      Matcher matcher = pattern.matcher(s);
+      return matcher.find();
+    } else {
+      throw new IOException("The matches function requires a String regex");
+    }
+  }
+
+  protected Checker constructChecker(Object value) throws IOException {
+    return null;
+  }
+}

solr/solrj/src/test/org/apache/solr/client/solrj/io/TestLang.java

@@ -75,7 +75,8 @@ public class TestLang extends SolrTestCase {
       "convexHull", "getVertices", "getBaryCenter", "getArea", "getBoundarySize","oscillate",
       "getAmplitude", "getPhase", "getAngularFrequency", "enclosingDisk", "getCenter", "getRadius",
       "getSupportPoints", "pairSort", "log10", "plist", "recip", "pivot", "ltrim", "rtrim", "export",
-      "zplot", "natural", "repeat", "movingMAD", "hashRollup", "noop", "var", "stddev", "recNum", "isNull", "notNull"};
+      "zplot", "natural", "repeat", "movingMAD", "hashRollup", "noop", "var", "stddev", "recNum", "isNull",
+      "notNull", "matches"};
 
   @Test
   public void testLang() {

solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/MathExpressionTest.java

@@ -1998,6 +1998,36 @@ public class MathExpressionTest extends SolrCloudTestCase {
   }
 
 
+  @Test
+  public void testMatches() throws Exception {
+    String cexpr = "having(list(tuple(a=\"Hello World\"), tuple(a=\"Good bye\")), matches(a, Hello))";
+    ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
+    paramsLoc.set("expr", cexpr);
+    paramsLoc.set("qt", "/stream");
+    String url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
+    TupleStream solrStream = new SolrStream(url, paramsLoc);
+    StreamContext context = new StreamContext();
+    solrStream.setStreamContext(context);
+    List<Tuple> tuples = getTuples(solrStream);
+    assertEquals(tuples.size(), 1);
+    Tuple tuple0 = tuples.get(0);
+    assertEquals(tuple0.getString("a"), "Hello World");
+
+    cexpr = "having(list(tuple(a=\"Hello World\"), tuple(a=\"Good bye\")), matches(a, \"(?i)good\"))";
+    paramsLoc = new ModifiableSolrParams();
+    paramsLoc.set("expr", cexpr);
+    paramsLoc.set("qt", "/stream");
+    url = cluster.getJettySolrRunners().get(0).getBaseUrl().toString()+"/"+COLLECTIONORALIAS;
+    solrStream = new SolrStream(url, paramsLoc);
+    context = new StreamContext();
+    solrStream.setStreamContext(context);
+    tuples = getTuples(solrStream);
+    assertEquals(tuples.size(), 1);
+    tuple0 = tuples.get(0);
+    assertEquals(tuple0.getString("a"), "Good bye");
+  }
+
+
   @Test
   public void testNotNullHaving() throws Exception {
     String cexpr = "having(list(tuple(a=add(1, 1)), tuple(b=add(1, 2))), notNull(b))";