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  • Code 
    pattern1 = r"\d|\((?R)\)"
pattern2 = r"(.*)00(?1)"
    Test Cases 
    import codewars_test as test
from solution import pattern1, pattern2
import regex

@test.describe("Recursive regex")
def test_group():
    @test.it("Pattern 1")
    def test_case():
        test.expect(regex.match(pattern1, "5"))
        test.expect(regex.match(pattern1, "(6)"))
        test.expect(regex.match(pattern1, "((((((9))))))"))
        
    @test.it("Pattern 2")
    def test_case():
        test.expect(regex.match(pattern2, "110011"))
        test.expect(regex.match(pattern2, "abc00abc"))
        test.expect(regex.match(pattern2, "00"))
    View Run Output