Replace all left spaces with a specific string

Question

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

Answer 1

You can use a callback function to generate the same length string which contains x.

console.log('  asdadasdad as asdasd asasd'.replace(/^\s+/, m => new Array(m.length).fill('x').join('')))

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Or alternately with positive look-behind(not supported widely, check here).

    console.log('  asdadasdad as asdasd asasd'.replace(/(?<=^\s*)\s/g, 'x'))