Currently, only Lat,Long format is handled by geocode widget. Several other formats exists, that should be handled by the widget (with degree, minuts and seconds, or cardinal points)

this gist can be used for regular expression : https://gist.github.com/moole/3707127/337bd31d813a10abcf55084381803e5bbb0b20dc

for each format, we should not only detect it as a coordinate, but extract longitude and latitude