In search of the perfect URL validation regex (2010)

Re:In search of the perfect URL validation regex (2010) by JadeNB on Saturday September 25, 2021 @05:31PM (#28656374)

I know we're not golfing, but it pains me to see that repetition in the middle. Mightn't we write

    if (!validateURL(url)) {
        url = "http://" + url;
        if (!validateURL(url)) {
            url = null;
        }
    }
    return url;

to snip a small probability of a bug?

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Re:In search of the perfect URL validation regex (2010) by wolfgang42 on Saturday September 25, 2021 @05:43PM (#28656466)

I find that branchiness (and mutation of the variable) harder to follow. Personally, I’d just take “parse, don’t validate” to its logical conclusion and go for:

    const parseUrl = url => validateUrl(url) ? url : null;
    return parseUrl(url) || parseUrl('http://'+url) || null;

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