Question

Here is the context

if (self.display.text hasPrefix:[NSString stringWithFormat:@"%@ = ", ANYLETTER])

Thanks Matt, I changed it a bit so it still checked for the rest of the formatting I had, now it works as expected. 🙂

if ([self.display.text rangeOfString:@" = "].location == 1 && [[NSCharacterSet letterCharacterSet] characterIsMember:[self.display.text characterAtIndex:0]])

EDITED: This just checks if the first character is a letter

char character = [self.display.text characterAtIndex:0];
if ([[NSCharacterSet lowercaseLetterCharacterSet] characterIsMember:character] || [[NSCharacterSet uppercaseLetterCharacterSet] characterIsMember:character])
{
    //String Starts With a Letter
}

Answer 1

if ([[NSCharacterSet letterCharacterSet] characterIsMember:[self.display.text characterAtIndex:0]])
{
    // Starts with letter.
}