From 96eb363b0178a42d764255f9cb7fe99adf31d42c Mon Sep 17 00:00:00 2001
From: DongLiang-0 <46414265+DongLiang-0@users.noreply.github.com>
Date: Sun, 8 Oct 2023 10:09:17 +0800
Subject: [PATCH] [fix](help-module)fix use regex match replaceAll may cause
 backtracking (#24918)

---
 .../org/apache/doris/common/MarkDownParser.java   | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/common/MarkDownParser.java b/fe/fe-core/src/main/java/org/apache/doris/common/MarkDownParser.java
index 200c106003..e796f766d9 100755
--- a/fe/fe-core/src/main/java/org/apache/doris/common/MarkDownParser.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/common/MarkDownParser.java
@@ -169,6 +169,19 @@ public class MarkDownParser {
         // Also, the header in md file is like "## STREAM-LOAD", we need to convert it to "STREAM LOAD",
         // so that we can execute "help stream load" to show the help doc.
         return Maps.immutableEntry(key.substring(headLevel).trim().replaceAll("-", " "),
-                sb.toString().replaceAll("\\s+$", "\n"));
+                processWhitespace(sb));
+    }
+
+    private String processWhitespace(StringBuilder sb) {
+        int index = sb.length() - 1;
+        while (index >= 0 && Character.isWhitespace(sb.charAt(index))) {
+            index--;
+        }
+
+        if (index < sb.length() - 1) {
+            sb.setLength(index + 1);
+            sb.append('\n');
+        }
+        return sb.toString();
     }
 }