diff --git a/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt b/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt
index 664525973..a88a59995 100644
--- a/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt
+++ b/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt
@@ -8,6 +8,10 @@ object HtmlFormatter {
     private val wrapHtmlRegex = "</?(?:div|p|br|hr|h\\d|article|dd|dl)[^>]*>".toRegex()
     private val notImgHtmlRegex = "</?(?!img)[a-zA-Z]+(?=[ >])[^<>]*>".toRegex()
     private val otherHtmlRegex = "</?[a-zA-Z]+(?=[ >])[^<>]*>".toRegex()
+    private val formatImagePattern = Pattern.compile(
+        "<img[^>]*src *= *\"([^\"{]*\\{(?:[^{}]|\\{[^}]+\\})+\\})\"[^>]*>|<img[^>]*data-[^=]*= *\"([^\"]*)\"[^>]*>|<img[^>]*src *= *\"([^\"]*)\"[^>]*>",
+        Pattern.CASE_INSENSITIVE
+    )
 
     fun format(html: String?, otherRegex: Regex = otherHtmlRegex): String {
         html ?: return ""
@@ -27,24 +31,32 @@ object HtmlFormatter {
             .replace("\\n\\s*$|^\\s*\\n".toRegex(), "")
             .replace("\\n\\s*\\n".toRegex(), "\n")
         //正则的“|”处于顶端而不处于（）中时，具有类似||的熔断效果，故以此机制简化原来的代码
-        val matcher = Pattern.compile("<img[^>]*src *= *\"([^\"{]*\\{(?:[^{}]|\\{[^}]+\\})+\\})\"[^>]*>|<img[^>]*data-[^=]*= *\"([^\"]*)\"[^>]*>|<img[^>]*src *= *\"([^\"]*)\"[^>]*>", Pattern.CASE_INSENSITIVE).matcher(keepImgHtml)
+        val matcher = formatImagePattern.matcher(keepImgHtml)
         var appendPos = 0
         val sb = StringBuffer()
-        while (matcher.find()){
+        while (matcher.find()) {
             var param = ""
-            sb.append( keepImgHtml.substring(appendPos, matcher.start()),"<img src=\"${
-                (NetworkUtils.getAbsoluteURL(redirectUrl,
-                    matcher.group(1)?.let {
-                        val urlMatcher = AnalyzeUrl.paramPattern.matcher(it)
-                        if(urlMatcher.find()) {
-                            param = ',' + it.substring(urlMatcher.end())
-                            it.substring(0,urlMatcher.start())
-                        } else it
-                    }?: matcher.group(2) ?: matcher.group(3)!!)) + param
-            }\">")
+            sb.append(
+                keepImgHtml.substring(appendPos, matcher.start()), "<img src=\"${
+                    (NetworkUtils.getAbsoluteURL(redirectUrl,
+                        matcher.group(1)?.let {
+                            val urlMatcher = AnalyzeUrl.paramPattern.matcher(it)
+                            if (urlMatcher.find()) {
+                                param = ',' + it.substring(urlMatcher.end())
+                                it.substring(0, urlMatcher.start())
+                            } else it
+                        } ?: matcher.group(2) ?: matcher.group(3)!!
+                    )) + param
+                }\">"
+            )
             appendPos = matcher.end()
         }
-        if (appendPos < keepImgHtml.length) sb.append(keepImgHtml.substring( appendPos, keepImgHtml.length ))
+        if (appendPos < keepImgHtml.length) sb.append(
+            keepImgHtml.substring(
+                appendPos,
+                keepImgHtml.length
+            )
+        )
         return sb.toString()
     }
 }