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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

  DB<55> p join ",",map {ord} split //, "\x{ 41 }"                    
+                                                  
0                                                                     
+                                                    
...
A                                                                     
+                                                    
  DB<60> p "\x{ 41 }"                                                 
+                                                  
^@

  DB<65> use warnings; "\x{ 263A }"                                   
+                                                  
Non-hex character ' ' terminates \x early.  Resolved as "\x{00}" at (e
+val

C:\tmp>%PERL% -w
print $];
...
Illegal hexadecimal digit ' ' ignored at - line 2.
__END__
5.024001

C:\tmp>%PERL_532% -w
print $];
...
Non-hex character ' ' terminates \x early.  Resolved as "\x{00}" at - 
+line 2.
__END__
5.032001