First commit for private source control. Older commits available on Github.

Assets/Plugins/SerializedCollections/Editor/Scripts/Search/SearchQuery.cs

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+using System.Collections.Generic;
+using UnityEditor;
+
+namespace AYellowpaper.SerializedCollections.Editor.Search
+{
+    public class SearchQuery
+    {
+        public string SearchString
+        {
+            get => _text;
+            set
+            {
+                if (_text == value)
+                    return;
+
+                _text = value;
+                foreach (var matcher in _matchers)
+                    matcher.Prepare(_text);
+            }
+        }
+
+        private IEnumerable<Matcher> _matchers;
+        private string _text;
+
+        public SearchQuery(IEnumerable<Matcher> matchers)
+        {
+            _matchers = matchers;
+        }
+
+        public List<PropertySearchResult> ApplyToProperty(SerializedProperty property)
+        {
+            TryGetMatchingProperties(property.Copy(), out var properties);
+            return properties;
+        }
+
+        public IEnumerable<SearchResultEntry> ApplyToArrayProperty(SerializedProperty property)
+        {
+            int arrayCount = property.arraySize;
+            for (int i = 0; i < arrayCount; i++)
+            {
+                var prop = property.GetArrayElementAtIndex(i);
+                if (TryGetMatchingProperties(prop.Copy(), out var properties))
+                    yield return new SearchResultEntry(i, prop, properties);
+            }
+        }
+
+        private bool TryGetMatchingProperties(SerializedProperty property, out List<PropertySearchResult> matchingProperties)
+        {
+            matchingProperties = null;
+            foreach (var child in SCEditorUtility.GetChildren(property, true))
+            {
+                foreach (var matcher in _matchers)
+                {
+                    if (matcher.IsMatch(child))
+                    {
+                        if (matchingProperties == null)
+                            matchingProperties = new();
+                        matchingProperties.Add(new PropertySearchResult(child.Copy()));
+                    }
+                }
+            }
+
+            return matchingProperties != null;
+        }
+    }
+}