I’m trying to extract only the “DELETE /[resource]” part from this list:
57.88.37.55 - - [01/Mar/2021:21:50:36 +0000] "DELETE /customers HTTP/1.1" 201 4730 244.240.70.241 - - [01/Mar/2021:21:50:36 +0000] "GET /users HTTP/1.1" 400 3081 16.102.244.72 - - [01/Mar/2021:21:50:36 +0000] "PATCH /users HTTP/1.1" 200 2344 78.7.87.158 - - [01/Mar/2021:21:50:36 +0000] "DELETE /parsers HTTP/1.1" 300 2897 77.51.66.200 - - [01/Mar/2021:21:50:36 +0000] "POST /lists HTTP/1.1" 200 3364 55.12.74.229 - - [01/Mar/2021:21:50:36 +0000] "GET /customers HTTP/1.1" 200 3927 194.115.77.20 - - [01/Mar/2021:21:50:36 +0000] "GET /events HTTP/1.1" 301 2249 95.62.102.64 - - [01/Mar/2021:21:50:36 +0000] "PATCH /events HTTP/1.1" 503 4334 6.36.213.6 - - [01/Mar/2021:21:50:36 +0000] "DELETE /alerts HTTP/1.1" 403 3533
Using the following code:
patternHTTPMethod = re.compile(r'([D]w+s/w+)') #Expressão regular para identificar o método HTTP DELETE e o recurso acedido
lstHTTPMethodDel=[]
for line in fstring:
lstHTTPMethodDel.append(patternHTTPMethod.search(line)[0])
print(lstHTTPMethodDel)
(fstring is a variable to which I attributed the list above)
But, alas, I receive the following error:
lstHTTPMethodDel.append(patternHTTPMethod.search(line)[0]) TypeError: 'NoneType' object is not subscriptable
Any ideas, approaches, to this problem?
Answer
Check if the regex matches before accessing the matched string:
patternHTTPMethod = re.compile(r'([D]w+s/w+)')
lstHTTPMethodDel=[]
for line in fstring:
match = patternHTTPMethod.search(line)
if match:
lstHTTPMethodDel.append(match[0])
print(lstHTTPMethodDel)