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javascript - Replace all left spaces with a specific string

I have following code to replace left spaces with a specific string but, It is not working as I want.

console.log('  asdadasdad as asdasd asasd'.replace(/^s+/, 'x'))
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This will surely do in two lines:

  var str ='   asdadasdad as asdasd asasd';   
  console.log(str.trim().padStart(str.length, 'x')); 

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