Notepad++ RegEx Find/Replace specified group and backreference

Question

I´ve had some trouble getting my RegEx find/replace working in NPP for hours. Here´s some code out of the files I´m working on: https://regex101.com/r/kQdy4L/6/ My goal is to replace all the "0>.|.|..." by their id name

test string

<movingPart index="0>8|1|3" referencePoint="0>8|1|0|4" referenceFrame="0>" scaleZ="true"/>
bla
bla
<i3dMapping id="KroneComprimaV180XC" node="0>" />
<i3dMapping id="novoGripPart2_fixPoint" node="0>8|1|0|4" />
<i3dMapping id="novoGrip_part2" node="0>8|1|3" />

substitution

<movingPart index="novoGrip_part2" referencePoint="novoGripPart2_fixPoint" referenceFrame="KroneComprimaV180XC" scaleZ="true"/>
bla
bla
<i3dMapping id="KroneComprimaV180XC" node="0>" />
<i3dMapping id="novoGripPart2_fixPoint" node="0>8|1|0|4" />
<i3dMapping id="novoGrip_part2" node="0>8|1|3" />

After some tial´n´error I got this RegEx

(".[>].*?")|<i3dMapping id=(?P<name>".*?") node=(".[>].*?")
(".[>].*?")|<i3dMapping id=(?P<name>".*?") node=(".[>].*?")\=1

Which do find either nodes+ids or only the nodes I need to replace however I can´t figure out how to replace all "0>.|.|." with the id name

Thanks for helping me out, this is the first time I get confronted with RegEx, so this is all very confusing to me. Cheers Fred

@AryJazz thanks for helping me, the RegExp code posted by Nick does exactly what I was looking for. If you are still interested in input and outup check out his regex101 link — Jackaroo
– Jackaroo, Commented Feb 4, 2019 at 0:05

Nick · Accepted Answer · 2019-02-03 03:19:29Z

1

You can use this regexp to do the replacements for you:

(?<=(index|Point|Frame)=")([^"]+)(?=".*?id="([^"]+)" node="\2")

It uses a positive lookbehind for one of index=", Point=" or Frame=" (note we have to cut the reference off because a lookbehind must be of fixed length), followed by some number of non-" characters (that value being captured in group 2), then a positive lookahead for a string which looks like id="someidvalue" node="\2" where the \2 refers to the value captured earlier. The value someidvalue is captured in group 3.

You can then replace with $3. Note that you need to use Replace All, for some reason Notepad++ doesn't like replacing this on a match by match basis.

Here's a demo of the regex on regex101.com

edited Feb 3, 2019 at 3:19

answered Feb 3, 2019 at 2:41

Nick

147k23 gold badges67 silver badges106 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Jackaroo Over a year ago

Wow, thank you so much, that is exactly what I was looking for. It turned out there are some more dos and don´ts i needed to consider but thanks to you explanation I was able to modify the code so I can use it for all my files (lookbehind with fixed length, never would have thought about that). Thanks mate,

Collectives™ on Stack Overflow

Notepad++ RegEx Find/Replace specified group and backreference

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related