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57 lines
2.3 KiB
JavaScript
57 lines
2.3 KiB
JavaScript
'use strict';
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// TODO: Create Unittests that test all functions
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// We return new regexes everytime as opposed to using a constant regex because
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// regexes with the global flag maintain internal iterators that can cause problems:
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// http://bjorn.tipling.com/state-and-regular-expressions-in-javascript
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// http://www.2ality.com/2013/08/regexp-g.html
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export function getEmailRegex() {
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// This is a bit of a weak test for an email, but you really can't win them all
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// http://stackoverflow.com/questions/201323/using-a-regular-expression-to-validate-an-email-address
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return /.*@.*\..*/g;
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}
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export function getLinkRegex() {
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// You really can't win them all with urls too (unless a 500 character regex that adheres
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// to a strict interpretation of urls sounds like fun!)
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// https://mathiasbynens.be/demo/url-regex
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//
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// This was initially based off of the one angular uses for its linky
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// (https://github.com/angular/angular.js/blob/master/src/ngSanitize/filter/linky.js)...
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// but then it evovled into its own thing to support capturing groups for filtering the
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// hostname and other technically valid urls.
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//
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// Capturing groups:
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// 1. URL scheme
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// 2. URL without scheme
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// 3. Host name
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// 4. Path
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// 5. Fragment
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//
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// Passes most tests of https://mathiasbynens.be/demo/url-regex, but provides a few false
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// positives for some tests that are too strict (like `foo.com`). There are a few other
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// false positives, such as `http://www.foo.bar./` but c'mon, that one's not my fault.
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// I'd argue we would want to match that as a link anyway.
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//
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// Note: This also catches emails, as otherwise it would match the `ascribe.io` in `hi@ascribe.io`,
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// producing (what I think is) more surprising behaviour than the alternative.
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return /\b(https?:\/\/)?((?:www\.)?((?:[^\s.,;()\/]+\.)+[^\s$_!*()$&.,;=?+\/\#]+)((?:\/|\?|\/\?)[^\s#^`{}<>?"\[\]\/\|]+)*\/?(#[^\s#%^`{}<>?"\[\]\/\|]*)?)/g;
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}
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/**
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* @param {string} string String to check
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* @return {boolean} Whether string is an email or not
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*/
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export function isEmail(string) {
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return !!string && string.match(getEmailRegex());
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}
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/**
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* @param {string} string String to check
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* @return {boolean} Whether string is an link or not
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*/
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export function isLink(string) {
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return !!string && string.match(getLinkRegex());
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}
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