Functions and CALL Routines

NOTDIGIT Function

Searches a character string for any character that is not a digit, and returns the first position at which that character is found.

Category:	Character
Restriction:	I18N Level 2

Syntax
Arguments
Details
Comparisons
Examples
See Also

Syntax

NOTDIGIT(string <,start>)

Arguments

string: is the character constant, variable, or expression to search.
start: is an optional numeric constant, variable, or expression with an integer value that specifies the position at which the search should start and the direction in which to search.

Details

The results of the NOTDIGIT function depend directly on the translation table that is in effect (see TRANTAB System Option) and indirectly on the ENCODING System Option and the LOCALE System Option in the SAS National Language Support (NLS): Reference Guide.

The NOTDIGIT function searches a string for the first occurrence of any character that is not a digit. If such a character is found, NOTDIGIT returns the position in the string of that character. If no such character is found, NOTDIGIT returns a value of 0.

If you use only one argument, NOTDIGIT begins the search at the beginning of the string. If you use two arguments, the absolute value of the second argument, start, specifies the position at which to begin the search. The direction in which to search is determined in the following way:

If the value of start is positive, the search proceeds to the right.
If the value of start is negative, the search proceeds to the left.
If the value of start is less than the negative length of the string, the search begins at the end of the string.

NOTDIGIT returns a value of zero when one of the following is true:

The character that you are searching for is not found.
The value of start is greater than the length of the string.
The value of start = 0.

Comparisons

The NOTDIGIT function searches a character string for any character that is not a digit. The ANYDIGIT function searches a character string for a digit.

Examples

The following example uses the NOTDIGIT function to search for a character that is not a digit.

data _null_;
   string='Next = _n_ + 12E3;'; 
   j=0;
   do until(j=0);
      j=notdigit(string,j+1);
      if j=0 then put +3 "That's all";
      else do;
         c=substr(string,j,1);
         put +3 j= c=;
      end;
   end;
run;

The following lines are written to the SAS log:

   j=1 c=N
   j=2 c=e
   j=3 c=x
   j=4 c=t
   j=5 c= 
   j=6 c==
   j=7 c= 
   j=8 c=_
   j=9 c=n
   j=10 c=_
   j=11 c= 
   j=12 c=+
   j=13 c= 
   j=16 c=E
   j=18 c=;
   That's all