SUBSTR
Returns a substring of textitem, starting at position. The textitem can be a literal string, a constant preceded by a %, or the string returned by a macro function.
Syntax
name SUBSTR textitem, position ⟦, length⟧
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Returns a substring of textitem, starting at position. The textitem can be a literal string, a constant preceded by a %, or the string returned by a macro function.
name SUBSTR textitem, position ⟦, length⟧