[erlang-questions] guard sequence for string?

jm <>
Tue Jan 30 04:04:02 CET 2007

Is there a guard sequence to test if a supplied parameter is a ascii 
string, ie, is_string, the same as there is is_integer? I check the docs 
and am unable to find anything. I tried is_list() but this doesn't seem 
to do what I want (it was a long shot). So what's the stardard approach 


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