While testing the dynamic removal of credit card numbers, an analyst lands on using therexcommand.

Therexcommand in Splunk can be used to extract or replace data using regular expressions. To dynamically replace values with a specific pattern, such as replacing credit card numbers with "X", the mode needs to be set tosed. Thesedmode allows for string replacement within a field using regular expressions, enabling the substitution of matching patterns with a specified string.