Pos Function

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by Zarko Gajic
Zarko Gajic is experienced in SQL and has working knowledge of DB systems such as MS SQL Server, Firebird, Interbase, and Oracle. He is also proficient in XML, DHTML, and JavaScript.
Updated January 28, 2019

The Pos function in Delphi returns an integer specifying the position of the first occurrence of one string within another.

It's instantiated like this:

Pos(String,Source);

What It Does

Pos looks for the first complete occurrence of the specified String — generally offered literally, in single quotes — in Source. The Source is usually some variable. If Pos finds the string, it returns the character position in Source of the first character in Str as an integer value, otherwise it returns 0.

The String and the Source must both be strings.

Example 

var s : string;
 i : integer;
 
s:='DELPHI PROGRAMMING';
i:=Pos('HI PR',s);

In this example, the variable i will return the integer 5, because the specified string begins with the letter H, which is in the fifth position in Source.