Help with text RGB syntax

[Rik]

Could someone with access to Matlab run the following examples?  I'd like
to know how picky the Tex parser is about the RGB color specification.

text (0.5,0.4, 'Hello \color[rgb]{1,0,0}World')
text (0.5,0.5, 'Hello \color[rgb]{1 0 0}World')
text (0.5,0.6, 'Hello \color[rgb]{1;0;0}World')
text (0.5,0.7, 'Hello \color[rgb]{1, 0, 0}World')

All I need to know is which syntax examples succeed.

Thanks,
Rik