An array that contains the names of intervals sets.
Arguments
pattern, ignore.case, perl, fixed, useBytes
see 'grep'
db
optional database path to filter intervals. If specified, only
interval sets from that database are returned.
Details
This function returns a list of named intervals sets that match the pattern
(see 'grep'). If called without any arguments all named intervals sets are
returned.
When multiple databases are connected, the 'db' parameter can be used to
filter intervals to only those from a specific database.