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  1.  
  2. var whatever = 'Some [b]random[/b] text in a [b]sentence.[/b]';
  3. whatever = whatever.replace(/\[(\/?)b\]/g,'<$1b>');
  4.  
  5. print(whatever);
  6.  
Success #stdin #stdout 0.01s 4940KB
stdin
Standard input is empty
stdout
Some <b>random</b> text in a <b>sentence.</b>