Nested String Parsing Macro

The `AHGscan2` macro is designed to extract a specific element from a given character string, handling two levels of delimiters. It uses SAS^©'s `%SCAN` function in a nested manner: a first `%SCAN` to isolate a section of the main string using the first delimiter (`dlm`), then a second `%SCAN` on this section to extract a precise element using the second delimiter (`dlm2`). The default delimiters are the backslash (\) and the hash (#). This macro is useful for parsing complex structured strings where information is separated by different delimitation schemes within segments.

Data Analysis

Type : CREATION_INTERNE

The macro operates on a character string passed to it as a parameter (`mac`). It neither creates nor directly uses external or internal SAS data sets (SASHELP). The 'data' processed is the input string provided during the macro call.

1 Code Block

MACRO

Explanation :
This block defines the `AHGscan2` macro. It takes four parameters: `mac` (the source string), `i` (the index of the element to extract at the first scan level), `j` (the index of the element to extract at the second scan level), `dlm` (the first delimiter, defaulting to `\`) and `dlm2` (the second delimiter, defaulting to `#`). The body of the macro performs an external `%SCAN` using `dlm` on the `mac` string at index `i`, then an internal `%SCAN` on the result with `dlm2` at index `j`. The final result is the extracted substring.

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1	%macro AHGscan2(mac,i,j,dlm=\,dlm2=#);
2	%scan(%scan(&mac,&i,&dlm),&j,&dlm2)
3	%mend;
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