Regex Notepad ++ Del除了IP之外的所有内容

Question

Have a text file, each line contains an IP address with useless info. Want to delete useless info around the IP.

Each line looks like:

%BER-1-887373: Group <Connect> User <gacan> IP <72.34.184.200> No IPv6 address available

Need the IP Address only

The < > surround the IP and need to delete those as well.

Any help appreciated

Answer 1

Assuming you don't have any other groups of numbers separated by periods and enclosed in <...> , you can find:

.*<(\d{1,3}(?:\.\d{1,3}){3})>.*

and replace with

$1

This doesn't validate the IP address; it just finds 4 groups of 1-3 numbers inside <...> and with periods between groups.

Given your sample text, this would reduce this line

%BER-1-887373: Group <Connect> User <gacan> IP <72.34.184.200>

to just 72.34.184.200 .

Demo

Explanation:

• .* - match any character zero or more times (anything from the start of the line to the < )
• < - match a literal character <
• ( - start a capturing group so we can use it in the replacement
  • \\d{1,3} - match 1 to 3 digits
  • (?: - start a non-capturing group
    • \\. - match a literal .
    • \\d{1,3} - match 1-3 digits
  • ) - end the non-capturing group
  • {3} - repeat the non-capturing group 3 times (to give us a total of 4 groups of digits, with 3 periods in between them)
• ) - end the capturing group
• > - match a literal >
• .* - match any character zero or more times (the rest of the line)

The replacement $1 means to use the first capturing group (the part between ( and ) ), which in this case is the IP address. ( $0 would be all matched text, which in this case is the entire line).

Answer 2

Do a find replace:

• Find what: .*?(\\d{1,3}((.\\d{1,3}){3})).*
• Replace whith: \\1
• select Regular Expression
• Hit Replace all

The pattern is not perfect as it does not limit the range of the valid numbers (eg 999.999.999.99 will be matched too).

Answer 3

Regex tend to be complicated at times and there is a good chance you get it wrong. If all the lines are supposed to be in the specified format ie three words before IP and two words following it, I would use Macros. Let's say the example is:

abc xyz xxxx <127.23.32.120> xxx xyz

1. I would bring the cursor to the end of the first line.
2. Press the record marco button (red button at the top)
3. Press Ctrl + Bksp twice. This will delete the xyz and xxx characters.
4. Press Bksp twice: This deletes the space and > characters
5. Press Ctrl + Left Arrow 7 times. This will move the cursor at the beginning of the IP
6. Press Ctrl + Bksp 4 times. This will delete the other useless text and leave you just with the IP in the first line.
7. Press Down Arrow followed by the End button to move to the end of the next line
8. Stop recording the macro.
9. Play the marco until the end of the file.