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  print $str."\n<br />";
  if ( ($str =~ /\\r/) or ($str =~ /\\n/) or ($str =~ /\\f/) or ($str 
+=~ /\\t/) ) { ##0
...
  if ($str =~ /\r|\n|\t|\f/) { print "matches on single backslash\n<br
+ />";} ##3
  if ( ($str =~ /\\n/) ) { print "matches \\\\n (with double backslash
+)\n<br />";} ##4
  if ($str =~/\s/) { print "matches on \\s  \n<br />";}##5

rrrrrrrrrr
matches in character class

rrrrrrrr\nrr
found ws using multiple regexps and or with double backslashes
matches on ws using simple '|' list with double backslashes
matches in character class
matches \\n (with double backslash)

rrrrrrrr\rr
found ws using multiple regexps and or with double backslashes
matches on ws using simple '|' list with double backslashes
matches in character class