Does python's re.sub take an array as the input parameter?

Question

According to http://www.php2python.com/wiki/function.preg-replace-callback/ re.sub is the python equivlant of PHP's preg_replace_callback, but the php version takes an array for the strings to be matched, so you can pass multiple strings, but the re.sub appears to take only a single string.

Is that right or is it my weak knowledge of python?

Answer 1

If you want to do it on an array, you can use a list comprehension, eg

>>> array_of_strings = ["3a1", "1b2", "1c", "d"]
>>> [re.sub("[a-zA-Z]", "", elem) for elem in array_of_strings]
["31", "12", "1", ""]

though if you're using a complicated expression, you should probably use re.compile on the pattern first

Answer 2

它只需要一个字符串http://docs.python.org/library/re.html#re.sub

Answer 3

Late to the party I know, but if this was a requirement for a many step process you wanted to encapsulate into a function, then you could process through numpy vectorize:

def EliminateAlpha(elem):
    return re.sub("[a-zA-Z]", "", elem)

ElimAlphaArray = np.vectorize(ElimateAlpha)

array_of_strings = ["3a1", "1b2", "1c", "d"]
print(ElimAlphaArray(array_of_strings))

['31' '12' '1' '']

Of course, you can use the re.sub function directly into vectorize:

ElimAlphaArr = np.vectorize(re.sub)
print(ElimAlphaArr("[a-zA-Z]", "", array_of_strings))

['31' '12' '1' '']