# Function Reference

# StringIsXDigit

Checks if a string contains only hexadecimal digit (0-9, A-F) characters.

StringIsXDigit ( "string" )

## Parameters

string | The string to check

## Return Value

Success: | 1.
Failure: | 0 if string contains non-hexadecimal characters.

## Remarks

As in other StringIs...() the check is stop if a Chr(0) is encountered inside the string.
Internally the C function is used to speed up the processing.
Valid characters are 0123456789abcdefABCDEF.
Note that a string containing whitespace or the "0x" prefix will cause StringIsXDigit() to return 0.

## Related

StringIsAlNum, StringIsAlpha, StringIsASCII, StringIsDigit, StringIsLower, StringIsSpace, StringIsUpper, StringLower, StringUpper

## Example

    #include <MsgBoxConstants.au3>

    MsgBox($MB_SYSTEMMODAL, "", "Is the string 42 a hexadecimal digit: " & StringIsXDigit("42") & @CRLF & _ ; Returns 1, as the string contains only hexadecimal (0-9, A-F) characters.
            "Is the string 00 a hexadecimal digit: " & StringIsXDigit("00") & @CRLF & _ ; Returns 1, as the string contains only hexadecimal (0-9, A-F) characters.
            "Is the string 1.0 a hexadecimal digit: " & StringIsXDigit("1.0") & @CRLF & _ ; Returns 0, due to the decimal point.
            "Is the number 1.0 a hexadecimal digit: " & StringIsXDigit(1.0) & @CRLF & _ ; Returns 1, due to the number to string conversion.
            "Is the string 'A string' a hexadecimal digit: " & StringIsXDigit("A string.") & @CRLF) ; Returns 0, due to the string containing whitespace.