Final answer:
The text appears to contain a regular expression pattern for credit card numbers and additional instructions for handling them in a software configuration file.
Step-by-step explanation:
The text you provided appears to contain a regular expression (REGEX) pattern that matches credit card numbers. The pattern represents a credit card number that starts with a number that is captured as a group (CC_NUM), followed by twelve digits (d12), followed by a period and four more digits (d4).
The provided text also includes additional instructions on how the captured credit card number should be handled. The 'DEST_KEY' specifies the destination key for the captured credit card number, and the 'FORMAT' determines the format in which the credit card number should be displayed.
Without more context, it is difficult to determine the specific file in which you would find this text. However, based on the use of regular expressions and the mention of 'KEY' and 'FORMAT', it is likely that this text is a configuration or settings file for a software application or system.