Qs for profissional jquery how to extract URL from string and

Qs for profissional jquery how to extract URL from string and

how to extract full url from textarea and if content

http://domain.com/xxxxx/?xxx then change it to http://www.domain.com/xxxxx/?xxx

and if

www.domain.com/xxxxx/?xxx then change it to http://www.domain.com/xxxxx/?xxx

and if

domain.com/xxxxx/?xxx then change it to http://www.domain.com/xxxxx/?xxx

Please help me please

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