Functions and CALL Routines |
Category: | Character |
Restriction: | I18N Level 0 |
Syntax | |
Arguments | |
Details | |
Examples | |
See Also |
Syntax |
NVALID(string<,validvarname>) |
specifies a character constant, variable, or expression which will be checked to determine whether its value can be used as a SAS variable name.
Note: Trailing blanks are ignored.
Tip: | Enclose a literal string of characters in quotation marks. |
is a character constant, variable, or expression that specifies one of the following values:
Default: | If no value is specified, the NVALID function determines that string is a valid SAS variable name based on the value of the SAS system option VALIDVARNAME=. |
Details |
The NVALID function checks the value of string to determine whether it can be used as a SAS variable name.
The NVALID function returns a value of 1 or 0.
Condition | Returned Value | |
---|---|---|
string can be used as a SAS variable name | 1 | |
string cannot be used as a SAS variable name | 0 |
Examples |
This example determines the validity of specified strings as SAS variable names. The value that is returned by the NVALID function varies with the validvarname argument. The value of 1 is returned when the string is determined to be a valid SAS variable name under the rules for the specified validvarname argument. Otherwise, the value of 0 is returned.
options validvarname=v7 ls=64; data string; input string $char40.; v7=nvalid(string,'v7'); any=nvalid(string,'any'); nliteral=nvalid(string,'nliteral'); default=nvalid(string); datalines; Tooooooooooooooooooooooooooo Long OK Very_Long_But_Still_OK_for_V7 1st_char_is_a_digit Embedded blank !@#$%^&* "Very Loooong N-Literal with """N 'No closing quotation mark ; proc print noobs; title1 'NLITERAL and Validvarname Arguments Determine'; title2 'Invalid (0) and Valid (1) SAS Variable Names'; run;
Determining the Validity of SAS Variable Names with NLITERAL
NLITERAL and Validvarname Arguments Determine 1 Invalid (0) and Valid (1) SAS Variable Names string v7 any nliteral default Tooooooooooooooooooooooooooo Long 0 0 0 0 0 0 0 0 OK 1 1 1 1 Very_Long_But_Still_OK_for_V7 1 1 1 1 1st_char_is_a_digit 0 1 1 0 Embedded blank 0 1 1 0 !@#$%^&* 0 1 1 0 "Very Loooong N-Literal with """N 0 0 1 0 'No closing quotation mark 0 1 0 0
See Also |
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Rules for Words and Names in the SAS Language in SAS Language Reference: Concepts |
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