micropython/tests/extmod/ure_error.py

# test errors in regex

try:
    import ure as re
except ImportError:
    try:
        import re
    except ImportError:
        print("SKIP")
        raise SystemExit

def test_re(r):
    try:
        re.compile(r)
        print("OK")
    except: # uPy and CPy use different errors, so just ignore the type
        print("Error")

test_re(r'?')
test_re(r'*')
test_re(r'+')
test_re(r')')
test_re(r'[')
test_re(r'([')
test_re(r'([)')