Docs / String
BuildRowsetFromString is an AMPscript function in the string category. Access parts with Row() + Field(row, 1).
BuildRowsetFromString(str, delimiter)
%%[ SET @parts = BuildRowsetFromString("red,green,blue", ",") ]%%
%%=Field(Row(@parts, 2), 1)=%%
green
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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BuildRowsetFromString in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.