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