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

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:
(courtesy of RegexBuddy)

HTH,
Tim

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.

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

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

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