diff --git a/kernel/model/search.go b/kernel/model/search.go
index c78cc0515..05a0d37e1 100644
--- a/kernel/model/search.go
+++ b/kernel/model/search.go
@@ -830,17 +830,19 @@ func replaceTextNode(text *ast.Node, method int, keyword string, replacement str
 				newContent = bytes.ReplaceAll(text.Tokens, []byte(keyword), []byte(replacement))
 			}
 		} else {
-			// 当搜索结果中的文本元素包含大小写混合时替换失败
-			// Replace fails when search results contain mixed case in text elements https://github.com/siyuan-note/siyuan/issues/9171
-			keywords := strings.Split(keyword, " ")
-			// keyword 可能是 "foo Foo" 使用空格分隔的大小写命中情况，这里统一转换小写后去重
-			if 0 < len(keywords) {
-				var lowerKeywords []string
-				for _, k := range keywords {
-					lowerKeywords = append(lowerKeywords, strings.ToLower(k))
+			if "" != strings.TrimSpace(keyword) {
+				// 当搜索结果中的文本元素包含大小写混合时替换失败
+				// Replace fails when search results contain mixed case in text elements https://github.com/siyuan-note/siyuan/issues/9171
+				keywords := strings.Split(keyword, " ")
+				// keyword 可能是 "foo Foo" 使用空格分隔的大小写命中情况，这里统一转换小写后去重
+				if 0 < len(keywords) {
+					var lowerKeywords []string
+					for _, k := range keywords {
+						lowerKeywords = append(lowerKeywords, strings.ToLower(k))
+					}
+					lowerKeywords = gulu.Str.RemoveDuplicatedElem(lowerKeywords)
+					keyword = strings.Join(lowerKeywords, " ")
 				}
-				lowerKeywords = gulu.Str.RemoveDuplicatedElem(lowerKeywords)
-				keyword = strings.Join(lowerKeywords, " ")
 			}
 
 			if bytes.Contains(bytes.ToLower(text.Tokens), []byte(keyword)) {
@@ -945,7 +947,7 @@ func FullTextSearchBlock(query string, boxes, paths []string, types map[string]b
 		typeFilter := buildTypeFilter(types)
 		boxFilter := buildBoxesFilter(boxes)
 		pathFilter := buildPathsFilter(paths)
-		if 2 > len(strings.Split(query, " ")) {
+		if 2 > len(strings.Split(strings.TrimSpace(query), " ")) {
 			blocks, matchedBlockCount, matchedRootCount = fullTextSearchByQuerySyntax(query, boxFilter, pathFilter, typeFilter, ignoreFilter, orderByClause, beforeLen, page, pageSize)
 		} else {
 			docMode = true // 文档全文搜索模式 https://github.com/siyuan-note/siyuan/issues/10584
@@ -1304,7 +1306,12 @@ func fullTextSearchByRegexp(exp, boxFilter, pathFilter, typeFilter, ignoreFilter
 	fieldFilter := fieldRegexp(exp)
 	stmt := "SELECT * FROM `blocks` WHERE " + fieldFilter + " AND type IN " + typeFilter
 	stmt += boxFilter + pathFilter + ignoreFilter + " " + orderBy
-	regex := regexp.MustCompile(exp)
+	regex, err := regexp.Compile(exp)
+	if nil != err {
+		util.PushErrMsg(err.Error(), 5000)
+		return
+	}
+
 	blocks := sql.SelectBlocksRegex(stmt, regex, Conf.Search.Name, Conf.Search.Alias, Conf.Search.Memo, Conf.Search.IAL, page, pageSize)
 	ret = fromSQLBlocks(&blocks, "", beforeLen)
 	if 1 > len(ret) {
@@ -1458,7 +1465,10 @@ func highlightByRegexp(query, typeFilter, id string) (ret []string) {
 	fieldFilter := fieldRegexp(query)
 	stmt := "SELECT * FROM `blocks` WHERE " + fieldFilter + " AND type IN " + typeFilter
 	stmt += " AND root_id = '" + id + "'"
-	regex := regexp.MustCompile(query)
+	regex, _ := regexp.Compile(query)
+	if nil == regex {
+		return
+	}
 	sqlBlocks := sql.SelectBlocksRegex(stmt, regex, Conf.Search.Name, Conf.Search.Alias, Conf.Search.Memo, Conf.Search.IAL, 1, 256)
 	for _, block := range sqlBlocks {
 		keyword := gulu.Str.SubstringsBetween(block.Content, search.SearchMarkLeft, search.SearchMarkRight)