Function match2

test/compute-engine/patterns.test.ts:871–872

(pattern, x)

// For example, "ax+b" can match "ax" or "x+b".
describe('NON EXACT WILDCARDS', () => {
  const match2 = (pattern, x) =>
    match(pattern, x, { substitution: { _x: ce.expr('_x') } });

  it('should match x for a + x', () => {
    const result = match2(['Add', '_a', '_x'], '_x');