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+ | # $EPIC: isdigit.txt,v 1.1.1.1 2006/07/11 04:57:43 jnelson Exp $ | ||
+ | ======Synopsis:====== | ||
+ | $__isalpha__(<text>) \\ | ||
+ | $__isdigit__(<text>) | ||
+ | |||
+ | ======Technical:====== | ||
+ | These function test whether the first character in the given string is | ||
+ | an alphabetical character or a digit. Only the first character is | ||
+ | tested. | ||
+ | |||
+ | ======Practical:====== | ||
+ | These functions are useful for testing an input string to see whether it | ||
+ | is a number or a text string. One use for this might be to check if it | ||
+ | would be suitable input for $[[iptoname]]() or $[[nametoip]](). Keep in mind | ||
+ | that only the first character is tested, so this isn't a reliable way | ||
+ | to see if the entire string is a number. | ||
+ | |||
+ | ======Returns:====== | ||
+ | "true" or "false" value if first character is a letter or a digit | ||
+ | |||
+ | ======Examples:====== | ||
+ | <file> | ||
+ | $isalpha(hello) returns true | ||
+ | $isalpha(2hello) returns false | ||
+ | $isdigit(123) returns true | ||
+ | $isdigit(2abc) returns true | ||
+ | $isdigit(a123) returns false | ||
+ | </file> | ||