Page History

...

And an example with contains, testing if the title contains the word Camel

simple("${in.header.title} contains 'Camel'")

And an example with regex, testing if the number header is a 4 digit value:

simple("${in.header.number} regex '\d{4}'")

And finally an example if the header equals any of the values in the list. Each element must be separated by comma, and no space around.
This also works for numbers etc, as Camel will convert each element into the type of the left hand side.

simple("${in.header.type} in 'gold,silver'")

...