[erlang-questions] How to split such a string elegantly ?

[z_axis]

The string contains two parts separated by "-", such as "red - blue" . 
However, sometimes there may be no red or blue part.   For example, the
following are all right string.
"1 2 3 - 33 23",  "- 33 23", "1 2 3 -", etc.

>[NoRed,NoBlue] = string:tokens("1 2 3 - 33 23","-").
["1 2 3 "," 33 23"]

>[NoRed,NoBlue] = string:tokens("- 33 23","-").   % i hope it returns ["","
33 23"]
** exception error: no match of right hand side value [" 33 23"]

>[NoRed,NoBlue] = string:tokens("1 2 3 -","-").   % i hope it returns [1 2 3
", ""]
** exception error: no match of right hand side value ["1 2 3 "]


Sincerely!

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