如何在Clickhouse中匹配汉字

Question

我尝试使用 clickhouse SQL.

从字符串中提取中文字符

我使用：

select extractAll('dkfdfjsd1234中文字符串', '[a-zA-Z]')

可以成功returns:

['d','k','f','d','f','j','s','d']

现在我想这样提取中文，我试过：

select extractAll('dkfdfjsd1234中文字符串', '[\u4e00-\u9fa5]')

它returns错误。

Code: 427, e.displayText() = DB::Exception: OptimizedRegularExpression: cannot compile re2: [\u4e00-\u9fa5], error: invalid escape sequence: \u. Look at https://github.com/google/re2/wiki/Syntax for reference. Please note that if you specify regex as an SQL string literal, the slashes have to be additionally escaped. For example, to match an opening brace, write '\(' -- the first slash is for SQL and the second one is for regex (version 20.8.14.4 (official build))

Answer 1

要匹配 Unicode 点，请使用 \x{FFFF}:

SELECT extractAll('dkfdfjsd1234中文字符串', '[\x{4e00}-\x{9fa5}]') AS result

/*
┌─result─────────────────────┐
│ ['中','文','字','符','串'] │
└────────────────────────────┘
*/

如何在Clickhouse中匹配汉字

How to match chinese characters in Clickhouse

sql

database

data-warehouse

clickhouse