Where can I use any_boolean_match for?

By Hajo Koerts admin, Created 24-APR-2017, last editted 12-MAY-2017

I thought this expression checks if a value exists in array/collection.
But when I try this don't get a result back in the logs.

What i have tried:
any_boolean_match(var:message, 'hajo') ? 'Hajooo' : 'NoHajo'

Can someone explain the expression 'any_boolean_match'?

I thought this expression checks if a value exists in array/collection.
But when I try this don't get a result back in the logs. 
What i have tried:
any_boolean_match(var:message, 'hajo') ? 'Hajooo' : 'NoHajo'
Can someone explain the expression 'any_boolean_match'?

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