@ISDIGIT[string] : Returns 1 if string is entirely composed of decimal digits (0- 9); 0 otherwise.

 

See also: @ISALNUM, @ISALPHA, @ISASCII, @ISCNTRL, @ISPRINT, @ISPUNCT, @ISSPACE, @ISXDIGIT.

 

Example:

 

echo %@isdigit[0]

1

 

echo %@isdigit[123.456]

0

 

echo %@isdigit[-123]

0