[Gambas-user] Select Case problem

[Tobias Boege]

On Thu, 28 Mar 2013, Tobias Boege wrote:
> On Thu, 28 Mar 2013, Bruce wrote:
> > On Thu, 2013-03-28 at 17:05 +1030, Bruce wrote:
> > > Hi,
> > > 
> > > I am trying to parse a text file that contains key,value pairs like:
> > >         Name=Malarky
> > >         Size=10
> > >         BackImage[N]=sometext
> > >         FrontImage[S]=sometext
> > >         etc
> > > using a construct like
> > >         For idx = 0 to sourcearray.max
> > >           Select Upper(Split(SourceArray[idx],"+")[0])
> > >             Case "NAME"
> > >               blah blah
> > >             Case "SIZE"
> > >               blah blah
> > >             Case Like "BACKIMAGE[*]"
> > >               blah blah
> > >             Case Like "FRONTIMAGE[*]"
> > >               blah blah
> > >           End Select
> > >         Next
> > > 
> > > This fails because Case Like "BACKIMAGE[*]" is being interpreted as a
> > > regular expression where I need to escape the regexp "[]" meaning.
> > > 
> > > Trying to use escapes like 
> > >   Case Like "BACKIMAGE\[*\]" 
> > > fails as \[ is an unknown escape sequence.
> > > 
> > > Any clues?
> > > 
> > > tia
> > > Bruce
> > > 
> > 
> > Sorry, I have over simplified that.  I also need to discern lines like
> >         BACKIMAGE[*]
> > from lines like
> >         BACKIMAGE[*][*]
> > so 
> >         Like "BACKIMAGE*"
> > wont work.
> > 
> > B
> 
> OK. If the lines above (from your most recent mail) are literal strings,
> then you'll need something like:
> 
> Case Like "BACKIMAGE\\[*\\]" ' The compiler transforms "\\" to a literal "\"
>                              ' so that you end up with the right expression.
> 
> to match "BACKIMAGE[*]" but since you want to distinguish between, e.g.
> "BACKIMAGE[*]" and "BACKIMAGE[*][*]" - why would you use "Case Like", i.e. a
> regular expression at all? These are distinct strings you want to keep
> distinct, no need to group them by regular expressions then?

Oops, since you want "[*]" literal at the end of your strings which are
actually three characters with special LIKE meaning, you must use:

Case Like "BACKIMAGE\\[\\*\\]"

Just in case you still need regular expressions and I misunderstood
something.

Regards,
Tobi