Notepad ++正则表达式从起始位置开始每隔n个字符插入一个字符

Question

How do you use regex to insert | every two characters from a starting position to the end of the line?

Using regex on the following sample (tshark output of packet data), the regex inserts | after the first two characters and the next two characters, but does not apply the pattern to the rest of the line. I think the issue is with a repeated pattern on the 2nd grouping (or lackthereof).

Sample:

1478646603.255173000    10.10.10.1  0000000000000000000000

^(.{34})(..) replace with \1|\2|   OR   ^(.{34})(.*?(..)) replace with \1|\2

Produces this:

1478646603.255173000    10.10.10.1  00|00|000000000000000000

What I want is:

1478646603.255173000    10.10.10.1  00|00|00|00|00|00|00|00|00|00|00

Answer 1

You may use

(?:\G(?!^)|^.{36})\K..(?!$)

and replace with $&| .

Details :

• (?:\\G(?!^)|^.{36}) - matches the location at the end of the previous successful match (with \\G(?!^) ) or ( | ) the start of a line ( ^ ) and the first 36 characters other than linebreak chars ( .{36} )
• \\K - the match reset operator that discards the whole text matched so far
• .. - any 2 chars other than linebreak chars
• (?!$) - that are not at the end of the string.

The replacement pattern only contains the backreference to the whole match ( $& ) and a | pipe symbol (a literal symbol in the replacement pattern).