Top and tail

var s = " \t\v\r\n\ffoo bar \t\v\r\n\f"
say s.strip_beg.dump     # remove leading whitespaces
say s.strip_end.dump     # remove trailing whitespaces
say s.strip.dump         # remove both leading and trailing whitespace

Output:

"foo bar \t\13\r\n\f"
" \t\13\r\n\ffoo bar"
"foo bar"