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OPAL case-sensitive filtering with match_regex

OPAL filters are case-insensitive by default. Case-sensitive filtering is used when the filter verb is combined with the match_regex function.

Given the following string:

log: 2024-04-06T12:49:00Z,eventName=GetPolicy

The following example uses the filter verb's support for OPAL functions to call match_regex, which can use the case insensitivity regular expression flag: