Re^6: Unescaped left brace in regex is passed through in regex

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\x{263A}     [1,8]  hex char          (example shown: SMILEY)
\x{ 263A }          Same, but shows optional blanks inside and
                    adjoining the braces
\x1b         [2,8]  restricted range hex char (example: ESC)

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  DB<1> $str2='\\x{263}'                                              
+          

...
  DB<4> print hex $str2                                               
+          
0

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DB<6> $str3='\\\\\\\x{aF}'                                            
+        

...
0

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  DB<10> $str4='\x{aF}'                                               
+          

...
0
  DB<13> print hex 'aF'                                               
+          
175

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