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'oh {hello there' =~ /
   ([{]{0,1})  # Matches '' (after some backtracking)
   hello       # Matches 'hello'
   (?(1)\})    # Matches ''
/x;

'oh hello} there' =~ /
   ([{]{0,1})  # Matches ''
   hello       # Matches 'hello'
   (?(1)\})    # Matches ''
/x;

/
   {hello}   # '{hello}'
...
   hello     # 'hello'
   (?! } )   # Not followed by '}'
/x