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expression: The string to mask.
num_chars: The number of characters to mask.
uc_mask: Controls the mask character for upper case letters.
lc_mask: Controls the mask character for lower case letters.
num_mask: Controls the mask character for numbers.
Examples
By default, upper case letters are converted to X
, lower case letters are converted to x
, and numbers are converted to n
. You can override the characters used in the mask by supplying optional arguments. The second argument controls the mask character for upper case letters, the third argument for lower case letters, and the fourth argument for numbers.
Returns a masked version of a string with the last num_chars characters masked. By default, if you do not provide a mask value, the last four characters are masked.