yiguolei commented on code in PR #2475:
URL: https://github.com/apache/doris-website/pull/2475#discussion_r2174743914
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i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/sql-manual/sql-functions/scalar-functions/string-functions/regexp-count.md:
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@@ -0,0 +1,175 @@
+---
+{
+ "title": "REGEXP_COUNT",
+ "language": "zh-CN"
+}
+
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+ http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+## 描述
+这是一个用于统计字符串中匹配给定正则表达式模式的字符数量的函数。输入包括用户提供的字符串和正则表达式模式。返回值为匹配字符的总数量；如果未找到匹配项，则返回
0。
+
+1. 'str' 参数为 “string” 类型，是用户希望通过正则表达式进行匹配的字符串。
+
+2. 'pattern' 参数为 “string” 类型，是用于匹配字符串的正则表达式模式字符串。
+
+3. 返回值为 “int” 类型，表示成功匹配的字符数量。
+
+
+
+## 语法
+
+```sql
+REGEXP_COUNT(<str>, <pattern>)
+```
+
+## 参数
+
+| 参数 | 描述 |
+| -- | -- |
+| `<str>` | 该参数为 “string” 类型，是通过正则表达式匹配得到的目标值。
+| `<pattern>` |该参数为 “string” 类型，是一个正则表达式，用于匹配符合该模式规则的字符串。
+
+## 返回值
+
+- 返回正则表达式 “pattern” 在字符串 “str” 中的匹配字符数量，返回类型为 “int”。若没有字符匹配，则返回 0。
Review Comment:
如果明确了行为之后，得把这两个行为补充到测试case 章节
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