When you are executing a vertical lookup in Microsoft Excel across a chaotic string array (e.g., searching for a specific employee, but you only know their last name or a fragment of their email), a standard Exact Match VLOOKUP is mathematically guaranteed to fail. To force the Excel engine to execute a high-speed geometric scan based on partial string fragments, you must inject Wildcard operators into the payload.
Understanding the Wildcard Architecture
The VLOOKUP engine natively supports two distinct cryptographic wildcard operators within its lookup_value argument, allowing you to mathematically bridge unknown string data.
- The Asterisk (
*): Represents any sequence of characters of any length (including absolute zero). It acts as a geometric expanding block. - The Question Mark (
?): Represents exactly one single, strict alphanumeric character.
Executing the Partial Match Extraction
Imagine your firm has an employee database in Sheet2!A1:B500. Column A contains full names (“John Smith”, “Alice Smith”, “Bob Jones”). Column B contains their ID number. You need to extract the ID for the first person whose last name is “Smith”. You do not know their first name.
To execute the partial extraction vector, click an empty cell and type the precise command:
=VLOOKUP("*Smith", Sheet2!A1:B500, 2, FALSE)The exact millisecond you press Enter, the Excel engine intercepts the arrays. The string "*Smith" mathematically instructs the engine to scan down Column A and lock onto the absolute first cell that ends with the exact string “Smith”, regardless of how many characters precede it (it will lock onto “John Smith”). It then drops one column to the right and rips out the ID.
Critical Rule: You MUST set the [range_lookup] argument to FALSE (Exact Match) for wildcards to function. If set to TRUE, the engine will ignore the operators and output corrupted data.