Get more match information with ,

Hi,
for example, we get this list when we press the key <Ctrl+n> or
<Ctrl+p>,

"
o_var
o_ojb
o_arr
"

now, i want to get more information as following,
"
o_var
o_ojb
o_arr
obj->method()
obj->method2()
"

how to let the vim match this "obj->method()" , usually, the vim just
matches the letter, underline, and figure.
how to match other sign, such as "obj>>method(), obj->method(),
obj.method()"

thanks guys

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