Your Flex file should define the following tokens:

POINT. When we match the command to plot a point.

VECTOR. When we match the command to draw a line.

CIRCLE. When we match the command to draw a circle.

BLOCK. When we match the command to draw a rectangle.

COLOR_CHANGE. Matches the command to change colors.

A way to match tabs, spaces, or newlines, and to ignore them.

A way to match anything not listed above, and to tell the user they messed up.

If this could be done in flex file/code that would be awesome! Regex statements need to be used!