Once a field is created using the regex method, can you modify the underlying regular expression?

When a field is created using the regex method in Splunk, that field is tied to the specific regular expression that was used during its creation. Once established, the underlying regex cannot be modified directly for that specific field extraction without altering the configuration files or the definition of the field.

This means if you wish to change the behavior of how the data is extracted for that field, you would need to update the field extraction settings in the relevant configuration file, like props.conf or transforms.conf, depending on how the regex is implemented. Therefore, the assertion that you cannot modify the underlying regular expression after a field has been created is accurate.

Although searches can utilize that field and dynamically change or create fields in the search-time context with different regular expressions, the original definition of the field itself remains unchanged. Thus, the answer correctly states that it is false that the underlying regex can be modified after a field has been created using the regex method.