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  \       Quote the next metacharacter
  []      Character class
  {}      Multiple pattern
...
  ~       User name home directory

The metanotation a{b,c,d}e is a shorthand for abe ace ade. Left to rig
+ht order is preserved, with results of matches being sorted separatel
+y at a low level to preserve this order. As a special case {, }, and 
+{} are passed undisturbed.