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  1. or download this
    (((\?+|(\?\/|\/)(\?\/)*\?*)|([^\'\"\/\s\?]|((\?|\/)\?+[^\s\?\"])|((\?\
+/|\/)(\?\/)*([^\'\"\/\s\?\*]|\?(\?+[^\?\"\s]|[^\'\"\/\s\?]))))([^\'\"
+\/\s\?]|\?\?+[^\?\"\s]|(\/|\?\/)(\?\/)*([^\'\"\/\s\?\*]|\?(\?+[^\?\"\
+s]|[^\'\"\/\s\?])))*((\?+|(\/|\?\/)(\?\/)*\?*)?))|((\'([^\'?\\]|\\.|\
+?(\?+(\/.|[^?\/])))*(\'|\?\'))|(\"([^\"\\?]|\\.|\?\?+(\/.|[^\?\"\/]))
+*(\"|\?+\"))))
  2. or download this
    while( $line = <> )
{
...
    print "mismatch\n";
  }
}
  3. or download this
    x
match
...
mismatch
x="2";
mismatch
  4. or download this
    (blank)
mismatch
...
match
//x
match