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diff --git a/src/main/java/org/onap/pnfsimulator/template/search/TemplateSearchHelper.java b/src/main/java/org/onap/pnfsimulator/template/search/TemplateSearchHelper.java
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+++ b/src/main/java/org/onap/pnfsimulator/template/search/TemplateSearchHelper.java
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+/*-
+ * ============LICENSE_START=======================================================
+ * Simulator
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.pnfsimulator.template.search;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import org.onap.pnfsimulator.template.search.handler.PrimitiveValueCriteriaBuilder;
+import org.onap.pnfsimulator.template.search.viewmodel.FlatTemplateContent;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.data.mongodb.core.query.Criteria;
+import org.springframework.data.mongodb.core.query.Query;
+import org.springframework.stereotype.Component;
+
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+@Component
+public class TemplateSearchHelper {
+    private static final String PARENT_TO_CHILD_KEY_SEPARATOR = ":"; //compliant with flat json stored in db
+    private static final String FLATTENED_JSON_KEY_REGEX = PARENT_TO_CHILD_KEY_SEPARATOR + "%s(?:(\\[[\\d]+\\]))?$";
+    private static final String FLATTENED_TEMPLATES_VIEW = "flatTemplatesView";
+
+    private MongoTemplate mongoTemplate;
+    private PrimitiveValueCriteriaBuilder criteriaBuilder;
+
+    @Autowired
+    public TemplateSearchHelper(MongoTemplate mongoTemplate) {
+        this.mongoTemplate = mongoTemplate;
+        this.criteriaBuilder = new PrimitiveValueCriteriaBuilder();
+    }
+
+    public List<String> getIdsOfDocumentMatchingCriteria(JsonObject jsonCriteria) {
+        if (isNullValuePresentInCriteria(jsonCriteria)) {
+            throw new IllegalJsonValueException("Null values in search criteria are not supported.");
+        }
+        Criteria mongoDialectCriteria = composeCriteria(jsonCriteria);
+        Query query = new Query(mongoDialectCriteria);
+        List<FlatTemplateContent> flatTemplateContents = mongoTemplate.find(query, FlatTemplateContent.class, FLATTENED_TEMPLATES_VIEW);
+        return flatTemplateContents
+                .stream()
+                .map(FlatTemplateContent::getId)
+                .collect(Collectors.toList());
+    }
+
+
+    private Criteria composeCriteria(JsonObject criteria) {
+        Criteria[] criteriaArr = criteria.entrySet()
+                .stream()
+                .map(this::mapEntryCriteriaWithRegex)
+                .toArray(Criteria[]::new);
+        return criteriaArr.length > 0 ? new Criteria().andOperator(criteriaArr) : new Criteria();
+    }
+
+    private Criteria mapEntryCriteriaWithRegex(Map.Entry<String, JsonElement> entry) {
+        Pattern primitiveOrArrayElemKeyRegex = getCaseInsensitive(String.format(FLATTENED_JSON_KEY_REGEX, entry.getKey()));
+        Criteria criteriaForJsonKey = Criteria.where("k").regex(primitiveOrArrayElemKeyRegex);
+        Criteria criteriaWithValue = criteriaBuilder.applyValueCriteriaBasedOnPrimitiveType(criteriaForJsonKey.and("v"), entry.getValue().getAsJsonPrimitive());
+        return Criteria.where("keyValues").elemMatch(criteriaWithValue);
+
+    }
+
+    private boolean isNullValuePresentInCriteria(JsonObject jsonObject) {
+        return jsonObject.entrySet()
+                .stream()
+                .map(Map.Entry::getValue)
+                .anyMatch(JsonElement::isJsonNull);
+    }
+
+    static Pattern getCaseInsensitive(String base) {
+        return Pattern.compile(base, Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
+    }
+}
+
+