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st: macro string extraction
Does anybody knows how to extract a substring of an arbitrary string
in order to place it into a macro?
More specifically, suppose i have a string "hey". I want the local
macro `first' to contain the string "h".
Can anybody recommend a way to do it?
In principle the macro extended function "piece" should do the trick,
however this function doesn't allow 1 1 (ones) as arguments (there is
a previous posting on this by StataCorp.)
Any help is greatly appreciated,
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