[Solved] how to add substring into a string

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You could use a regular expression:

const addPort = (url, port) => 
    url.replace(/^(https?:\/\/)?([^/]*)(\/.*)?$/, '$1' + '$2:' + port + '$3');

console.log(addPort('http://www.example.com/full/url/with/param', '8080'))

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solved how to add substring into a string