cword extend

Hi,

I have to process words which are nearest of non blank than alphanumerical and underscores chars.

In fact in a buffer I can have both cases and would like to differenciate them :
*R ; echo expand("<cword>") return R
R ; echo expand("<cword>") return R


How can I extend <cword> definition in order to differenciate *R from R.

Thank you

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