How to search words which not contain the search pattern?

[Sergeant]

Hello,

I have a file containing following lines:

AbcTempSpeed
XyzTempSpeed
_XyzSpeed
_ZeroTempSpeed
AbcSpeed
MedianTemSpeed
_AbcTempPressure

I need to find all words which do not include the pattern 'Temp'
('_XyzSpeed' , 'AbcSpeed' and 'MedianTemSpeed' in the above example).

Is this possible using UE regular expressions?

Thanks for any hint.
Regards
Sergeant

[pietzcker]

Hi Sergeant,

it is possible if you have UE V12 or higher (which you didn't tell us although the Readme forum topic is quite explicit about this).

The following Perl style regex will match a word that doesn't contain the string Temp:

Code: Select all

\b(?:(?!Temp)\w)+\b

(courtesy of RegexBuddy)

HTH,
Tim

[mjcarman]

That's clever, Tim. At first I thought that the (?:) was superfluous but I see now that you're using it to apply the negative look-ahead before each character.

[pietzcker]

I'd love to take credit for it, but I grokked it from RegexBuddy.

[Jane]

I could be wrong, but I think the ?: just creates a non-capturing group. It will work without it, but you'll waste resources saving the capture. The iteration is caused by having the + outside the parenthesis rather than inside. If you put it inside
i.e.\b(?:(?!Temp)\w+)\b
you will only avoid words that start with Temp.

Nice job Tim,
Jane

[mjcarman]

Jane, You are correct. The ?: makes the grouping a non-capturing one. The grouping is the important thing, not the (lack of) capture.