$is::{email,e_mail}()
Check for valid E-Mail address.
$is::{ip,i_p}()
Check for valid IP address.
$is::{json,j_s_o_n}()
Check for valid JSON string.
$is:{url,u_r_l}()
Check for valid URL address.
$is::anemon()
Check if input is an array or object.
$is::path()
Check for valid path.
$is::serial()
Check for valid string of serialized data.
$is::this()
Check.
$is::toggle()
Check for valid boolean value.
$is::void()
Check for empty string, array and object.