str2rgb

A simple utility to convert a ColorSpec value, represented as a string, to a numeric RGB triple. This function does not use eval. One possible use is for reading a user-entered color value from an editable text box.

Examples:
str2rgb('yellow') returns [1 1 0]
str2rgb('y') returns [1 1 0]
str2rgb('[1 1 0]') returns [1 1 0]
str2rgb('1 1 0') returns [1 1 0]
str2rgb('[1; 1; 0]') returns [1 1 0]
str2rgb('[0 0.5 0.91]') returns [0 0.5000 0.9100]
str2rgb('purple') returns NaN
str2rgb('[1 2]') returns NaN