From 81f80710385a0a115c3057f13fd52d04501ac934 Mon Sep 17 00:00:00 2001
From: Chris Galvan <chgalvan@amazon.com>
Date: Fri, 19 Nov 2021 09:07:31 -0600
Subject: [PATCH] Added regular expression filter for asset browser entries.

Signed-off-by: Chris Galvan <chgalvan@amazon.com>
---
 .../AssetBrowser/Search/Filter.cpp            | 34 +++++++++++++++++++
 .../AssetBrowser/Search/Filter.h              | 22 ++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.cpp b/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.cpp
index 3f267dedd0..d617638632 100644
--- a/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.cpp
+++ b/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.cpp
@@ -251,6 +251,40 @@ namespace AzToolsFramework
             return false;
         }
 
+        //////////////////////////////////////////////////////////////////////////
+        // RegExpFilter
+        //////////////////////////////////////////////////////////////////////////
+        RegExpFilter::RegExpFilter()
+            : m_filterPattern("")
+        {
+        }
+
+        void RegExpFilter::SetFilterPattern(const QString& filterPattern)
+        {
+            m_filterPattern = filterPattern;
+            Q_EMIT updatedSignal();
+        }
+
+        QString RegExpFilter::GetNameInternal() const
+        {
+            return m_filterPattern;
+        }
+
+        bool RegExpFilter::MatchInternal(const AssetBrowserEntry* entry) const
+        {
+            // no filter pattern matches any asset
+            if (m_filterPattern.isEmpty())
+            {
+                return true;
+            }
+
+            // entry's name matches regular expression pattern
+            QRegExp regExp(m_filterPattern);
+            regExp.setPatternSyntax(QRegExp::Wildcard);
+
+            return regExp.exactMatch(entry->GetDisplayName());
+        }
+
         //////////////////////////////////////////////////////////////////////////
         // AssetTypeFilter
         //////////////////////////////////////////////////////////////////////////
diff --git a/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.h b/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.h
index 5819ae92d7..94f47e0599 100644
--- a/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.h
+++ b/Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Search/Filter.h
@@ -115,6 +115,28 @@ namespace AzToolsFramework
             QString m_filterString;
         };
 
+        //////////////////////////////////////////////////////////////////////////
+        // RegExpFilter
+        //////////////////////////////////////////////////////////////////////////
+        //! RegExpFilter filters assets based on a regular expression pattern
+        class RegExpFilter
+            : public AssetBrowserEntryFilter
+        {
+            Q_OBJECT
+        public:
+            RegExpFilter();
+            ~RegExpFilter() override = default;
+
+            void SetFilterPattern(const QString& filterPattern);
+
+        protected:
+            QString GetNameInternal() const override;
+            bool MatchInternal(const AssetBrowserEntry* entry) const override;
+
+        private:
+            QString m_filterPattern;
+        };
+
         //////////////////////////////////////////////////////////////////////////
         // AssetTypeFilter
         //////////////////////////////////////////////////////////////////////////