XML Language Definition -> Regular Expression -> LookBehind - SyntaxEditor for Windows Forms Forum

Posted 15 years ago by Filipe Batista - Software/Hardware Developer, Cristaltec spa

Hi,

It seems that setting LookBehind with ^[ \f\t\v\x85]* in ExplicitPatternGroup it should match with :

"{begin of line}PatternValue", "{begin of line}{anyof [ \f\t\v\x85] zero or more}PatternValue".

but it doesn't match "{begin of line}PatternValue".

Have some ideas?

Filipe Batista
filipebatista@vodafone.pt

Comments (1)

Posted 15 years ago by Actipro Software Support - Cleveland, OH, USA

Currently LookBehind, LookAhead, and PatternValue require that at least one character be consumed for a match to occur. Since you have a * in your LookBehind, it has a chance that it will not return a match. You could probably move the look-behind to the main PatternValue expression and use the regex look-behind syntax there. See the documentation on what that syntax is.

We are going to be working on improving this in the future so that zero-width patterns can be matched in LookBehind and LookAhead.

Actipro Software Support

The latest build of this product (v2020.1 build 0403) was released 2 months ago, which was after the last post in this thread.

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