[concat_ws,concat](%E5%AD%97%E7%AC%A6%E4%B8%B2/concat_ws,concat.md) [replace,insert](%E5%AD%97%E7%AC%A6%E4%B8%B2/replace,insert.md) [length,repeat](%E5%AD%97%E7%AC%A6%E4%B8%B2/length,repeat.md) [position,locate](%E5%AD%97%E7%AC%A6%E4%B8%B2/position,locate.md) [正则](%E6%90%9C%E7%B4%A2/%E6%AD%A3%E5%88%99.md)