How to check if a character is correct

Question

I have a bunch of characters and want to remove everything that isn\'t a \'#\' \'.\' \'E\' and \'G\'.

I tried to use this:

if (buffer.get(buffertest) ==          


        

Answer 1

if (buffer.get(buffertest) == 'G'||
 buffer.get(buffertest) == 'E'||
 buffer.get(buffertest) == '#'||
 buffer.get(buffertest) == '.')