try: import re except ImportError: print("SKIP") raise SystemExit r = re.compile(".+") m = r.match("abc") print(m.group(0)) try: m.group(1) except IndexError: print("IndexError") # conversion of re and match to string str(r) str(m) 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(r"\n") m = r.match("\n") print(m.group(0)) m = r.match("\\") print(m) r = re.compile(r"[\n-\r]") m = r.match("\n") print(m.group(0)) r = re.compile(r"[\]]") m = r.match("]") print(m.group(0)) print("===") 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)) print("===") # '-' character within character class block print(re.match("[-a]+", "-a]d").group(0)) print(re.match("[a-]+", "-a]d").group(0)) print("===") 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)) m = re.match("a+?", "ab") print(m.group(0)) m = re.match("a*?", "ab") print(m.group(0)) m = re.match("^ab$", "ab") print(m.group(0)) m = re.match("a|b", "b") print(m.group(0)) m = re.match("a|b|c", "c") print(m.group(0)) # Case where anchors fail to match r = re.compile("^b|b$") m = r.search("abc") print(m) try: re.compile("*") except: print("Caught invalid regex") # bytes objects m = re.match(rb"a+?", b"ab") print(m.group(0)) print("===") # escaping m = re.match(r"a\.c", "a.c") print(m.group(0) if m else "") m = re.match(r"a\.b", "abc") print(m is None) m = re.match(r"a\.b", "a\\bc") print(m is None) m = re.match(r"[a\-z]", "abc") print(m.group(0)) m = re.match(r"[.\]]*", ".].]a") print(m.group(0)) m = re.match(r"[.\]+]*", ".]+.]a") print(m.group(0)) m = re.match(r"[a-f0-9x\-yz]*", "abxcd1-23") print(m.group(0)) m = re.match(r"[a\\b]*", "a\\aa\\bb\\bbab") print(m.group(0)) m = re.search(r"[a\-z]", "-") print(m.group(0)) m = re.search(r"[a\-z]", "f") print(m is None) m = re.search(r"[a\]z]", "a") print(m.group(0)) print(re.compile(r"[-a]").split("foo-bar")) print(re.compile(r"[a-]").split("foo-bar")) print(re.compile(r"[ax\-]").split("foo-bar")) print(re.compile(r"[a\-x]").split("foo-bar")) print(re.compile(r"[\-ax]").split("foo-bar")) print("===") # Module functions take str/bytes/re. for f in (re.match, re.search): print(f(".", "foo").group(0)) print(f(b".", b"foo").group(0)) print(f(re.compile("."), "foo").group(0)) try: f(123, "a") except TypeError: print("TypeError") print("===")