# Replace characters between two positions This function masks all characters included in the defined interval, while the ones outside the interval are copied to the output as is. | Option | Description | | --- | --- | | Method | The Randomly method
randomly selects a character. As a result, two identical input values can be
masked with different output values.

When the same value
appears twice in the input data, the Consistently method ensures that the function outputs the
same masked value in the same Job execution.

This function can encrypt the output masked
values in the same format as the input values, using Format-Preserving Encryption (FPE)
methods:



The FPE methods are bijective methods, except when
using tweaks.

The FF1 with
AES and FF1 with SHA-2 methods
require a password to generate encrypted and repeatable masked values. Those FPE methods
do not use a seed.

You can specify this password in the
password for FF1 method field, from the
Advanced Settings of the component. | | Extra parameter | This function requires two extra parameters.

The
extra parameters must be numbers, which are the start and the end values of
the interval.

You can enter a third extra parameter,
which is the replacement character. | In the first example, the first three characters are masked with the defined character. In the second example, the replacement character is not defined. The second, third and fourth characters are masked with random characters. | Input value | Method | Extra parameter | Example of a masked value | | --- | --- | --- | --- | | Jack | Randomly | "1,3,p" | pppk | | S1000D | Randomly | "2,4" | S0640D |