e_pat = r".+@.+"

input= ["pipo@gmail.com", 23, "trapo", "holi@gmail.com"]

for i in input
    println(ismatch(e_pat, i)) && println(i)
end

true

TypeError: non-boolean (Void) used in boolean context

Stacktrace:
 [1] macro expansion at ./In[27]:4 [inlined]
 [2] anonymous at ./<missing>:?
 [3] include_string(::String, ::String) at ./loading.jl:522

"pipo@gmail.com"
"holi@gmail.com"