Partially mask a string by replacing a given number of characters with a
fixed character. Masking can start from the beginning or end of the
string. This can be used on data of any type (numbers, longs, and so on)
and when de-identifying structured data we'll attempt to preserve the
original data's type. (This allows you to take a long like 123 and
modify it to a string like **3.
Number of characters to mask. If not set, all matching chars
will be masked. Skipped characters do not count towards this
tally.
When masking a string, items in this list will be skipped when
replacing characters. For example, if the input string is
555-555-5555 and you instruct Cloud DLP to skip - and
mask 5 characters with *, Cloud DLP returns
***-**5-5555.
