add reproduction case with regex with global flag

Author: timdeschryver

src/__tests__/matches.js

@@ -15,6 +15,14 @@ test('matchers accept regex', () => {
   expect(fuzzyMatches('ABC', node, /ABC/, normalizer)).toBe(true)
 })
 
+// https://stackoverflow.com/questions/1520800/why-does-a-regexp-with-global-flag-give-wrong-results
+test('matchers recreate regex to prevent global mistakes', () => {
+  const regex = /ABC/g
+  expect(matches('ABC', node, regex, normalizer)).toBe(true)
+  // without recreation of the regexp this would be false
+  expect(fuzzyMatches('ABC', node, regex, normalizer)).toBe(true)
+})
+
 test('matchers accept functions', () => {
   expect(matches('ABC', node, text => text === 'ABC', normalizer)).toBe(true)
   expect(fuzzyMatches('ABC', node, text => text === 'ABC', normalizer)).toBe(