Question

I need to check file extension when search over a directory.

if using re to do the matching work. those ‘.’ is interpreted as regex ‘.’

my code:

extension = ['.c','.h']
path = 'foo\bar\foobar.c'

def skipCheck(path):
    global extension 
    skip = True
    for i in extension :
        if(re.search(i,path)):
            skip = False
return skip

I know I could use backslash to do this.

extension = ['\.c','\.h']

But it is not easy to use and configure.I want to keep the [‘.c’,’.h’] input style.

Is there a way to convert and save them to another list of raw string for re.search.

Answer 1

1. Don’t use regexen; Python already has os.path.splitext.

   def skip_check(path):
       return os.path.splitext(path)[1] in extensions
   

   If you really must use a regex, you can call re.escape to escape all regex metacharacters.

2. Don’t declare extension global; you’re not assigning to it so you don’t need to. Also, you should call it extensions.