Filter out pins having same clock attribute

Question

Getting all fanin to the endpoint

get_pins [all_fanin -to <end_point>/d -flat -startpoints_only]

Above will give list of clocks pins coming to the endpoint.

Now If I want to filter out clock pins having clocks attribute as "clock_name1*", I am using below. This is giving error

filter_collection [get_pins [all_fanin -to <endpoint>/d -flat -startpoints_only]] "clocks=~clock_name1*"


Error: Type mismatch between '@clocks' and '"clock_name1"'. (FLT-006)
Error: while parsing filter expression: 
        at 'clocks==clock_name1
            ________^' (FLT-003)

clocks is a collection while clock name is string. Is there any way to resolve this?