I've been struggling with this one, supposedly simple, method for over an hour now, and I just dont get it. I'm trying to check if a String contains no visible content... e.g. it is like "\t \n \t\r", but nothing I do works. Could anyone give me a regex or something to call matches(regex) with? I cant seem to find one, and I've tried a for loop through the char array from getCharArray(), etc.
Thanks in advance,