This explains the use of substr (text, match [0], match [1]) in the last line of code.

这解释了最后一行代码中substr (text, match [0]，match[1])的使用。

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Mask column 3 by entering the following in the field that contains COL3: SUBSTR (COL3, 1, 5).

通过在包含COL3的字段中输入下面的内容可以屏蔽列3：substr (COL3, 1,5)。

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Functions like SUBSTR and LENGTH work with characters when called in conjunction with UCS-2 data types.

当用ucs - 2数据类型调用时，SUBSTR和LENGTH等函数处理字符。

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