diff --git a/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt b/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt
index 1579213dc..fe9034d49 100644
--- a/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/local/ImportBookActivity.kt
@@ -190,7 +190,7 @@ class ImportBookActivity : VMBaseActivity<ActivityImportBookBinding, ImportBookV
         adapter.selectedUris.clear()
         adapter.clearItems()
         launch(IO) {
-            val docList = DocumentUtils.listFiles(this@ImportBookActivity, lastDoc.uri)
+            val docList = DocumentUtils.listFiles(lastDoc.uri)
             for (i in docList.lastIndex downTo 0) {
                 val item = docList[i]
                 if (item.name.startsWith(".")) {
diff --git a/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt
index b7f1243c7..50d9986bc 100644
--- a/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/local/ImportBookViewModel.kt
@@ -47,7 +47,7 @@ class ImportBookViewModel(application: Application) : BaseViewModel(application)
         find: (docItem: DocItem) -> Unit,
         finally: (() -> Unit)? = null
     ) {
-        val docList = DocumentUtils.listFiles(context, documentFile.uri)
+        val docList = DocumentUtils.listFiles(documentFile.uri)
         docList.forEach { docItem ->
             if (docItem.isDir) {
                 DocumentFile.fromSingleUri(context, docItem.uri)?.let {
diff --git a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
index d1a023c88..66dc30de2 100644
--- a/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/widget/font/FontSelectDialog.kt
@@ -31,7 +31,7 @@ import kotlin.collections.ArrayList
 class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
     Toolbar.OnMenuItemClickListener,
     FontAdapter.CallBack {
-    private val fontRegex = Regex(".*\\.[ot]tf")
+    private val fontRegex = Regex("(?i).*\\.[ot]tf")
     private val fontFolder by lazy {
         FileUtils.createFolderIfNotExist(appCtx.filesDir, "Fonts")
     }
@@ -148,13 +148,7 @@ class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
 
     private fun loadFontFiles(doc: DocumentFile) {
         execute {
-            val fontItems = arrayListOf<DocItem>()
-            val docItems = DocumentUtils.listFiles(appCtx, doc.uri)
-            docItems.forEach { item ->
-                if (item.name.lowercase(Locale.getDefault()).matches(fontRegex)) {
-                    fontItems.add(item)
-                }
-            }
+            val fontItems = DocumentUtils.listFiles(doc.uri, fontRegex)
             mergeFontItems(fontItems, getLocalFonts())
         }.onSuccess {
             adapter.setItems(it)
@@ -175,21 +169,7 @@ class FontSelectDialog : BaseDialogFragment(R.layout.dialog_font_select),
 
     private fun loadFontFiles(path: String) {
         execute {
-            val fontItems = arrayListOf<DocItem>()
-            val file = File(path)
-            file.listFiles { pathName ->
-                pathName.name.lowercase(Locale.getDefault()).matches(fontRegex)
-            }?.forEach {
-                fontItems.add(
-                    DocItem(
-                        it.name,
-                        it.extension,
-                        it.length(),
-                        Date(it.lastModified()),
-                        Uri.parse(it.absolutePath)
-                    )
-                )
-            }
+            val fontItems = DocumentUtils.listFiles(path, fontRegex)
             mergeFontItems(fontItems, getLocalFonts())
         }.onSuccess {
             adapter.setItems(it)
diff --git a/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt b/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt
index 64fa913eb..fd6d709c0 100644
--- a/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/DocumentExtensions.kt
@@ -6,7 +6,9 @@ import android.net.Uri
 import android.provider.DocumentsContract
 import androidx.documentfile.provider.DocumentFile
 import io.legado.app.model.NoStackTraceException
+import splitties.init.appCtx
 import timber.log.Timber
+import java.io.File
 import java.nio.charset.Charset
 import java.util.*
 
@@ -93,13 +95,13 @@ object DocumentUtils {
         } ?: throw NoStackTraceException("打开文件失败\n${uri}")
     }
 
-    fun listFiles(context: Context, uri: Uri): ArrayList<DocItem> {
+    fun listFiles(uri: Uri, regex: Regex? = null): ArrayList<DocItem> {
         val docList = arrayListOf<DocItem>()
         var cursor: Cursor? = null
         try {
             val childrenUri = DocumentsContract
                 .buildChildDocumentsUriUsingTree(uri, DocumentsContract.getDocumentId(uri))
-            cursor = context.contentResolver.query(
+            cursor = appCtx.contentResolver.query(
                 childrenUri, arrayOf(
                     DocumentsContract.Document.COLUMN_DOCUMENT_ID,
                     DocumentsContract.Document.COLUMN_DISPLAY_NAME,
@@ -116,15 +118,18 @@ object DocumentUtils {
                 val dci = cursor.getColumnIndex(DocumentsContract.Document.COLUMN_LAST_MODIFIED)
                 if (cursor.moveToFirst()) {
                     do {
-                        val item = DocItem(
-                            name = cursor.getString(nci),
-                            attr = cursor.getString(mci),
-                            size = cursor.getLong(sci),
-                            date = Date(cursor.getLong(dci)),
-                            uri = DocumentsContract
-                                .buildDocumentUriUsingTree(uri, cursor.getString(ici))
-                        )
-                        docList.add(item)
+                        val name = cursor.getString(nci)
+                        if (regex == null || regex.matches(name)) {
+                            val item = DocItem(
+                                name = name,
+                                attr = cursor.getString(mci),
+                                size = cursor.getLong(sci),
+                                date = Date(cursor.getLong(dci)),
+                                uri = DocumentsContract
+                                    .buildDocumentUriUsingTree(uri, cursor.getString(ici))
+                            )
+                            docList.add(item)
+                        }
                     } while (cursor.moveToNext())
                 }
             }
@@ -136,6 +141,29 @@ object DocumentUtils {
         return docList
     }
 
+    fun listFiles(path: String, regex: Regex? = null): ArrayList<DocItem> {
+        val docItems = arrayListOf<DocItem>()
+        kotlin.runCatching {
+            val file = File(path)
+            file.listFiles { pathName ->
+                regex?.let {
+                    pathName.name.matches(it)
+                } ?: true
+            }?.forEach {
+                docItems.add(
+                    DocItem(
+                        it.name,
+                        it.extension,
+                        it.length(),
+                        Date(it.lastModified()),
+                        Uri.parse(it.absolutePath)
+                    )
+                )
+            }
+        }
+        return docItems
+    }
+
 }
 
 data class DocItem(