static const char *url_regex = "(ftp|http)s?://[-a-zA-Z0-9.?$%&/=_~#.,:;+()]*";

// keybindings
#define KEY_COPY    c
#define KEY_PASTE   v
#define KEY_PREV    p
#define KEY_NEXT    n
#define KEY_SEARCH  f
#define KEY_RSEARCH r
#define KEY_URL     j
#define KEY_RURL    k