Regular Expressions: NOT operator in SDL Trados Studio 2019

Question

It seems that the commonly used operators for NOT (^ and !) do not work in Trados SDL Studio filter. 
 Is this a bug or is there a different operator? 
 I suppose that the regex flavour is .Net.

Paul · Answer

Edson Furmankiewicz 
 
 Presumably you mean SDL Trados Studio? There is no such tool as Trados SDLX Studio? Or did you mean SDLX? 
 What do you mean by "filter", what exactly are you trying to? 
 Probably makes sense to read the help so you know what can be used and what cannot. Just because you are used to some special symbols having meaning in some other software you use doesn't mean they will work in every application.

Paul · Answer

Edson Furmankiewicz 
 ok...sort of clear. You showed us the Adanced Display Filter and a regex expression looking for a whitespace character followed by two stars... nothing to do with the NOT operator. 
 However, to use NOT in regex the caret does work when applied correctly and this means inside square brackets. The exclamation doesn't mean NOT in .NET regex at all. It has some special meanings when used as part of some lookarounds and maybe something else I can't think of. 
 The Community Advanced Display Filter has a very neat feature which can make it esier to exclude things as this can be qute tricky sometimes using regex in Studio. It supports a reverse filter, so you can create an expression to find what you don't want and then reverse it. Might be worth doing to things: 
 
 give us an example of what you want to achieve 
 try the Community version of this display filter: appstore.sdl.com/.../

Nora Díaz · Answer

Hi Edson, 
 
 Try this in the target field: 
 ^((?!\*).)*$

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Regular Expressions: NOT operator in SDL Trados Studio 2019