try: import ure as re except ImportError: import re r = re.compile(".+") m = r.match("abc") print(m.group(0)) try: m.group(1) except IndexError: print("IndexError") r = re.compile("(.+)1") m = r.match("xyz781") print(m.group(0)) print(m.group(1)) try: m.group(2) except IndexError: print("IndexError") r = re.compile("[a-cu-z]") m = r.match("a") print(m.group(0)) m = r.match("z") print(m.group(0)) m = r.match("d") print(m) m = r.match("A") print(m) print("===") r = re.compile("[^a-cu-z]") m = r.match("a") print(m) m = r.match("z") print(m) m = r.match("d") print(m.group(0)) m = r.match("A") print(m.group(0)) r = re.compile("o+") m = r.search("foobar") print(m.group(0)) try: m.group(1) except IndexError: print("IndexError") m = re.match(".*", "foo") print(m.group(0)) m = re.search("w.r", "hello world") print(m.group(0))