lower

lower#

The lower() function converts the provided string argument to lowercase.

Syntax#

lower(value)

Parameters#

• value: The string value to convert to lowercase (field name, bytes)

Return Value#

Returns the lowercase version of the input string.

Example#

lower(http.request.headers["User-Agent"][0]) // Converts the User-Agent header to lowercase

Use Cases#

• Normalising header values for consistent comparison
• Implementing case-insensitive matching in rules
• Standardising input for logging or analysis purposes