What is the correct syntax for regular expression in Snaplogic

Hi snaplogic Experts,

what is the right syntax for regular expression

^([^;]*;){6}[^;]{7}\K.

if i want to use it in replace function?
because this one:

$myString.replace(^([^;]*;){6}[^;]{7}\K., ‘’)

doesnt work

are there any escape characters or so?

Thank you