dynamic objects

[asaf_gu]

hi
i need some help to identify object in my application
the object is WebCheckBox

each time he change with random paramater
the object html id :
jbpnsdashboard_3a_2forit_2fdefault_2fexplore_2fdefault_2fexploresnpbjjbpnsdashboard_3a_2forit_2fdefault_2fexplore_2fdefault_2fexploresnpbj:_viewRoot:j_id1:j_id34:include_quick_search:chk_boards

the dynamic part is:
orit
j_id1
j_id34

i tried some regular Expressions but i didnt find appropriate syntax
please help