Automatic text linking
React, Components, Fragment, Regexp · Nov 3, 2020
Renders a string as plaintext, with URLs converted to appropriate link elements.
- Use
String.prototype.split()andString.prototype.match()with a regular expression to find URLs in a string. - Return matched URLs rendered as
<a>elements, dealing with missing protocol prefixes if necessary. - Render the rest of the string as plaintext.
const AutoLink = ({ text }) => {
const delimiter = /((?:https?:\/\/)?(?:(?:[a-z0-9]?(?:[a-z0-9\-]{1,61}[a-z0-9])?\.[^\.|\s])+[a-z\.]*[a-z]+|(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3})(?::\d{1,5})*[a-z0-9.,_\/~#&=;%+?\-\\(\\)]*)/gi;
return (
<>
{text.split(delimiter).map(word => {
const match = word.match(delimiter);
if (match) {
const url = match[0];
return (
<a href={url.startsWith('http') ? url : `http://${url}`}>{url}</a>
);
}
return word;
})}
</>
);
};ReactDOM.render(
<AutoLink text="foo bar baz http://example.org bar" />,
document.getElementById('root')
);
