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7.2.3.35 $LEN: Length of string

$LEN(string)’ returns the length of string in bytes. If string is not surrounded by quotes, it is interpreted as if it were quoted (so it is not expanded if it is a macro). Thus, in the example

     @m SS string
     $LEN(SS)

the value returned is 2, not 5.

To expand the argument before taking the length, one can say something like

     @m $XLEN(s) $LEN(s)