對于查詢含有日文平假名和片假名的字段，常規的 regexp 匹配可能不理想。以下是如何使用自定義函數進行準確查詢：
`
<br>create definer=wq19bar@% function jp_char_inside(s text) returns int(11)<br>begin</p><pre class="brush:php;toolbar:false">declare h text; declare p integer; declare l integer; declare head text; declare utf_8 text; set h = hex(s); set p = 1; set l = length(h); while p <= l do set head = substr(h, p, 1); if head < '8' then set p = p + 2; else set utf_8 = substr(h, p, 6); if (utf_8 >= 'E38181' and utf_8 <= 'E3829E') then return 1; end if; if (utf_8 >= 'E382A1' and utf_8 <= 'E383BE') then return 1; end if; set p = p + 6; end if; end while;
return 0;
end
`
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