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Javascript search and replace

/ Published in: JavaScript
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Why doesn't this work?

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Copy this code and paste it in your HTML 
  1. var str="foobar"; 
  2. var val="foo"; 
  3. var search='/'+val+'/i'; 
  4. alert(str.replace(search, '<strong>'+val+'</strong>'));
  5.  
  6. // it alerts "foobar" and not "<strong>foo</strong>bar"

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