playwright: [BUG] TestId Selector with regex does not find elements

Context:

• Playwright Version: 1.18.1
• Operating System: MacOS
• Node.js version: 16.13.1
• Browser: All

Code Snippet

test.only("should find testid with regex inside", async ({ page }) => {
  await page.setContent(`<section data-testid="foo-09:00" >43543</section>`);
  await page.setContent(`<section data-testid="foo-14:00" >43543</section>`);

  const regex = new RegExp(`foo-[0-9]+:[0-9]+$`);
  const locator = await page.locator(`data-testid=${regex}`).count();
  console.log("locator count", locator); // returns 0
});

Describe the bug

I have a case with calendar component which has hour elements where some are disabled and some are not and I am trying to find first one that is not disabled. This works fine in Cypress, yet for Playwright returns 0 for the counts. Am I perhaps missing something?

Kind regards, Damevi