javascript - Remove special characters and retain only one -

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I want to remove all the special characters in the beginning. Next I want to remove all the special characters when the string is finished and just want to keep one character.

Exemple:

String: 

  !! Online, !!

Result: 

  on-line,

You can use it: 

  '!! Online,' !!. Replace (/ ^ \ W + | (\ W) \ W * $ / g, "$ 1"); "On-line", "

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