ip address validation in python using regex

Question

In the following ip address validation i want to see if it a valid ip address or not how can i do this using the below re   gt  gt  gt  ip  241 1 1 112343434    gt  gt  gt  aa re match r  d 1 3    d 1 3    d 1 3    d 1 3   0-9   ip   gt  gt  gt  aa group   Traceback  most recent call last   File   lt stdin gt    line 1  in  lt module gt  AttributeError   NoneType  object has no attribute  group

User · Answer

d 1 3  will match numbers like 00 or 333 as well which wouldn t be a valid ID   This is an excellent answer from smink  citing   ValidIpAddressRegex        0-9   1-9  0-9  1 0-9  2  2 0-4  0-9  25 0-5      3   0-9   1-9  0-9  1 0-9  2  2 0-4  0-9  25 0-5

User · Answer

try      parts   ip split          return len parts     4 and all 0  lt   int part   lt  256 for part in parts  except ValueError      return False   one of the  parts  not convertible to integer except  AttributeError  TypeError       return False    ip  isn t even a string

User · Answer

Use anchors instead   aa re match r   d 1 3    d 1 3    d 1 3    d 1 3    ip    These make sure that the start and end of the string are matched at the start and end of the regex   well  technically  you don t need the starting   anchor because it s implicit in the  match   method    Then  check if the regex did in fact match before trying to access its results   if aa      ip   aa group     Of course  this is not a good approach for validating IP addresses  check out gnibbler s answer for a proper method   However  regexes can be useful for detecting IP addresses in a larger string   ip candidates   re findall r  b d 1 3    d 1 3    d 1 3    d 1 3  b   ip    Here  the  b word boundary anchors make sure that the digits don t exceed 3 for each segment

User · Answer

The following will check whether an IP is valid or not  If the IP is within 0 0 0 0 to 255 255 255 255  then the output will be true  otherwise it will be false    0 lt  int x  lt 256 for x in re split      re match r   d    d    d    d    your ip  group 0    count True   4   Example   your ip    10 10 10 10   0 lt  int x  lt 256 for x in re split      re match r   d    d    d    d    your ip  group 0    count True   4   Output    gt  gt  gt  your ip    10 10 10 10   gt  gt  gt   0 lt  int x  lt 256 for x in re split      re match r   d    d    d    d    your ip  group 0    count True   4 True  gt  gt  gt  your ip    10 10 10 256   gt  gt  gt   0 lt  int x  lt 256 for x in re split      re match r   d    d    d    d    your ip  group 0    count True   4 False  gt  gt  gt

User · Answer

Why not use a library function to validate the ip address    gt  gt  gt  ip  241 1 1 112343434    gt  gt  gt  socket inet aton ip  Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  socket error  illegal IP address string passed to inet aton

[python] ip address validation in python using regex

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