[Lazarus] Regexp syntax

[Mattias Gaertner]

On Tue, 15 Jun 2010 15:21:52 +0300
Juha Manninen <juha.manninen at phnet.fi> wrote:

> > > but I am sure it could be written in a cleaner way.
> > 
> > ^Tnt(([^L]|.[^X]).+)
> 
> Hmmm... It doesn't look very clean. It may be more correct but I am not sure 
> of that.

It is not very clean. It does not match TntL and TntL1.

 
> Does  [^L]|.[^X]  mean:
> anything but 'L' or anything, followed by anything but 'X' ?

The pipe is like an 'or' operator. [^L]|.[^X] means:
Any character but L OR any character followed by any character but X.
It matches a, b, La, Lb, but not LX and not L.

Even better regexp is:

^Tnt(([^L]|L[^X]).*|L$)


Mattias