Remove usage of RegExp (#1051)

Close #1049 

Eliminates use of RegExp so that we don't need to rely on the `recheck`
library (which can be quite slow to run) to ensure we remain in the safe
zone.

## Changes

- Task: Eliminates unused code that used RegExp
- Feat: Replaces RegExp usage with plain string functions
- E2E: Updates snapshots to account to recent Navbar updates

## How to test this PR

1. `yarn test:e2e:snapshot`
2. Re-run individual tests if they fail Snapshot testing

e2e/pages/shared-lending-platform/Navigation.spec.ts

@@ -170,7 +170,7 @@ test('Navigation', async ({ page, navigateToFilingHome }) => {
       .getByRole('link', { name: 'Diversity & Inclusion' })
       .click();
     await expect(page.locator('h1')).toContainText(
-      'Diversity and inclusion at the Bureau',
+      'Office of Minority and Women Inclusion at the Bureau',
     );
     await page.goBack();
 

src/App.tsx

@@ -2,9 +2,7 @@ import { useQuery } from '@tanstack/react-query';
 import { MarkdownText } from 'MarkdownTest';
 import { fetchUserProfile } from 'api/requests';
 import useSblAuth from 'api/useSblAuth';
-import classNames from 'classnames';
 import FooterCfGovWrapper from 'components/FooterCfGovWrapper';
-import { Link } from 'components/Link';
 import { LoadingApp, LoadingContent } from 'components/Loading';
 import ScrollToTop from 'components/ScrollToTop';
 import { Alert, PageHeader, SkipNav } from 'design-system-react';
@@ -75,44 +73,6 @@ if (import.meta.env.DEV) {
 }
 if (!isRoutingEnabled) console.warn('Routing is disabled!');
 
-/**
- * Determine if the current provided URL (href) is the current page
- * @param href string
- * @returns string
- */
-const deriveClassname = (href: string): string => {
-  let cname = 'nav-item';
-  const pattern = `${href}$`;
-
-  const regex = new RegExp(pattern);
-  if (regex.test(window.location.href)) {
-    cname += ' selected';
-  }
-
-  return cname;
-};
-
-interface NavItemProperties {
-  className: string;
-  href: string;
-  label: string;
-}
-
-export function NavItem({
-  href,
-  label,
-  className,
-}: NavItemProperties): JSX.Element {
-  return (
-    <Link
-      {...{ href }}
-      className={classNames(deriveClassname(href), className)}
-    >
-      {label}
-    </Link>
-  );
-}
-
 function BasicLayout(): ReactElement {
   const headerLinks = [...useHeaderAuthLinks()];
   const location = useLocation();

src/components/Link.utils.tsx

@@ -29,12 +29,16 @@ export const isExternalLinkImplied = (targetUrl: string): boolean => {
   const internalProtocols = ['mailto:'];
   if (internalProtocols.includes(parsed.protocol)) return false;
 
-  // Any subdomain of consumerfinance.gov or the current host
-  const isInternalDomain = new RegExp(
-    `([\\S]*\\.)?(consumerfinance\\.gov|${window.location.host})`,
-  ).test(parsed.host);
+  // [Internal] Any subdomain of consumerfinance.gov or the current host
+  const internalHosts = [
+    'www.consumerfinance.gov',
+    'sblhelp.consumerfinance.gov',
+    window.location.host,
+  ];
+
+  const isExternal = !internalHosts.includes(parsed.host);
 
-  return !isInternalDomain;
+  return isExternal;
 };
 
 // External link icon w/ spacing

src/pages/Filing/FilingApp/FilingSteps.helpers.tsx

@@ -6,9 +6,7 @@ import { FilingStatusAsNumber } from 'types/filingTypes';
 // Does the current browser URL correspond to this Step?
 const isStepCurrent = (stepPath: string): boolean => {
   const { pathname } = window.location;
-  const matcher = new RegExp(stepPath);
-  if (matcher.test(pathname)) return true;
-  return false;
+  return pathname.includes(stepPath);
 };
 
 const getUploadStatus = (