Functions and CALL Routines |
Category: | Character |
Restriction: | I18N Level 2 |
Syntax | |
Arguments | |
Details | |
Comparisons | |
Examples | |
Example 1: Scanning a String from Left to Right | |
Example 2: Scanning a String from Right to Left | |
See Also |
Syntax |
ANYALNUM(string <,start>) |
specifies a character constant, variable, or expression to search.
is an optional integer that specifies the position at which the search should start and the direction in which to search.
Details |
The results of the ANYALNUM 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 SAS National Language Support (NLS): Reference Guide.
The ANYALNUM function searches a string for the first occurrence of any character that is a digit or an uppercase or lowercase letter. If such a character is found, ANYALNUM returns the position in the string of that character. If no such character is found, ANYALNUM returns a value of 0.
If you use only one argument, ANYALNUM 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.
ANYALNUM returns a value of zero when one of the following is true:
Comparisons |
The ANYALNUM function searches a character string for an alphanumeric character. The NOTALNUM function searches a character string for a non-alphanumeric character.
Examples |
The following example uses the ANYALNUM function to search a string from left to right for alphanumeric characters.
data _null_; string='Next = Last + 1;'; j=0; do until(j=0); j=anyalnum(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=8 c=L j=9 c=a j=10 c=s j=11 c=t j=15 c=1 That's all
The following example uses the ANYALNUM function to search a string from right to left for alphanumeric characters.
data _null_; string='Next = Last + 1;'; j=999999; do until(j=0); j=anyalnum(string,1-j); 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=15 c=1 j=11 c=t j=10 c=s j=9 c=a j=8 c=L j=4 c=t j=3 c=x j=2 c=e j=1 c=N That's all
See Also |
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