Check if a string starts with http using Javascript
This should work:
var pattern = /^((http|https|ftp):\/\/)/;
if(!pattern.test(url)) {
url = "http://" + url;
}
jsFiddle
export const getValidUrl = (url = "") => {
let newUrl = window.decodeURIComponent(url);
newUrl = newUrl.trim().replace(/\s/g, "");
if(/^(:\/\/)/.test(newUrl)){
return `http${newUrl}`;
}
if(!/^(f|ht)tps?:\/\//i.test(newUrl)){
return `http://${newUrl}`;
}
return newUrl;
};
Tests:
expect(getValidUrl('https://www.test.com')).toBe('https://www.test.com');
expect(getValidUrl('http://www.test.com')).toBe('http://www.test.com');
expect(getValidUrl(' http : / / www.test.com')).toBe('http://www.test.com');
expect(getValidUrl('ftp://www.test.com')).toBe('ftp://www.test.com');
expect(getValidUrl('www.test.com')).toBe('http://www.test.com');
expect(getValidUrl('://www.test.com')).toBe('http://www.test.com');
expect(getValidUrl('http%3A%2F%2Fwww.test.com')).toBe('http://www.test.com');
expect(getValidUrl('www . test.com')).toBe('http://www.test.com');