* &sysdate * * &sysdate* * 28JAN99*
%VERIFY Autocall Macro
Returns the position of the first character unique to an expression.
Type: Autocall macro
Requirement: MAUTOSOURCE system option
Syntax
%VERIFY(source, excerpt)
Required Arguments
source
is text or a text expression that you want to examine for characters that do not exist
in excerpt.
excerpt
is text or a text expression. This is the text that defines the set of characters that
%VERIFY uses to examine source.
Details
Note: Autocall macros are included in a library supplied by SAS. This library might not
be installed at your site or might be a site-specific version. If you cannot access this
macro or if you want to find out if it is a site-specific version, see your on-site SAS
support personnel. For more information, see “Storing and Reusing Macros” on page
115.
%VERIFY returns the position of the first character in source that is not also present in
excerpt. If all characters in source are present in excerpt, %VERIFY returns 0.
Example: Testing for a Valid Fileref
The ISNAME macro checks a string to verify that it is a valid fileref and prints a
message in the SAS log that explains why a string is or is not valid.
%macro isname(name);
%let name=%upcase(&name);
%if %length(&name)>8 %then
%put &name: The fileref must be 8 characters or less.;
%else %do;
%let first=ABCDEFGHIJKLMNOPQRSTUVWXYZ_;
%let all=&first.1234567890;
%let chk_1st=%verify(%substr(&name,1,1),&first);
%let chk_rest=%verify(&name,&all);
%if &chk_rest>0 %then
%put &name: The fileref cannot contain
"%substr(&name,&chk_rest,1)".;
%if &chk_1st>0 %then
%put &name: The first character cannot be
194 Chapter 13 • AutoCall Macros
"%substr(&name,1,1)".;
%if (&chk_1st or &chk_rest)=0 %then
%put &name is a valid fileref.;
%end;
%mend isname;
%isname(file1)
%isname(1file)
%isname(filename1)
%isname(file$)
When this program executes, the following is written to the SAS log:
FILE1 is a valid fileref.
1FILE: The first character cannot be "1".
FILENAME1: The fileref must be 8 characters or less.
FILE$: The fileref cannot contain "$".
%VERIFY Autocall Macro 195
196 Chapter 13 • AutoCall Macros
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