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let urlString = "https://www.example.com/";
if (urlString.startsWith("https://") || urlString.startsWith("http://")) {
console.log("valid");
} else {
console.log("unvalid");
}
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function isValidURL(string) {
var res = string.match(/(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/g);
return (res !== null)
};
var testCase1 = "http://en.wikipedia.org/wiki/Procter_&_Gamble";
alert(isValidURL(testCase1));
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function isValidUrl(str) {
const pattern = new RegExp(
'^([a-zA-Z]+:\\/\\/)?' + // protocol
'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|' + // domain name
'((\\d{1,3}\\.){3}\\d{1,3}))' + // OR IP (v4) address
'(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*' + // port and path
'(\\?[;&a-z\\d%_.~+=-]*)?' + // query string
'(\\#[-a-z\\d_]*)?$', // fragment locator
'i'
);
return pattern.test(str);
}
console.log(isValidUrl('https://www.freecodecamp.org/')); // true
console.log(isValidUrl('mailto://freecodecamp.org')); // true
console.log(isValidUrl('freeCodeCamp')); // false
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function isValidURL(string) {
var res = string.match(/(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/g);
return (res !== null)
};
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function isValidHttpUrl(string) {
let url;
try {
url = new URL(string);
} catch (_) {
return false;
}
return url.protocol === "http:" || url.protocol === "https:";
}
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const isAbsoluteUrl = url => /^[a-z][a-z0-9+.-]*:/.test(url);
// Example
isAbsoluteUrl('https://1loc.dev'); // true
isAbsoluteUrl('https://1loc.dev/foo/bar'); // true
isAbsoluteUrl('1loc.dev'); // false
isAbsoluteUrl('//1loc.dev');