python - 将标志作为参数传递给 re.compile

Question

我想根据类似于以下的逻辑将某些标志传递给 re.compile 函数。我想知道是否可以这样做。

  flags = ""

  if multiline:
    flags = 're.M'

  if dotall:
    flags = flags + '|re.S'

  if verbose:
    flags = flags + '|re.X'

  if ignorecase:
    flags = flags + '|re.I'

  if uni_code:
    flags = flags + '|re.U'

  regex = re.compile(r'Test Pattern', flags)

Answer 1

re 标志只是数字。所以，我们需要对它们进行二进制或操作，就像这样

flags = 0

if multiline:
  flags = re.M

if dotall:
  flags |= re.S

if verbose:
  flags |= re.X

if ignorecase:
  flags |= re.I

if uni_code:
  flags |= re.U

regex = re.compile(r'Test Pattern', flags)