# Function Reference

# StringIsASCII

Checks if a string contains only ASCII characters in the range 0x00 - 0x7f (0 - 127).

StringIsASCII ( "string" )

## Parameters

string | The string to check

## Return Value

Success: | 1.
Failure: | 0 if string contains extended ASCII 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.

## Related

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

## Example

    #include <MsgBoxConstants.au3>

    Local $sString = "This is a sentence with whitespace." ; Check whether this string contains only ASCII characters.
    If StringIsASCII($sString) Then
        MsgBox($MB_SYSTEMMODAL, "", "The variable contains ASCII characters.")
    Else
        MsgBox($MB_SYSTEMMODAL, "", "The variable does not contain ASCII characters.")
    EndIf