st: are Macro variable always possible ?

[John Litfiba <cariboupad@gmx.fr>]

Dear Statalist,

I have a very simple question about macro variables:

I would like to define a macro variable which stores a long sequence
of data restrictions that I use after any IF qualifier when a function
allows it ..

For example instead of writing

 regress Y X if var1=="hello"&var2==1&var3==43&var6=="hello
again"&!missing(var34) ,

I tried to define a macro as

 local filter var1=="hello"&var2==1&var3==43&var6=="hello again"&!missing(var34)

in order to simply write

regress Y X if `filter'

However it doent seem to work as Stata doesnt like at all the part
var1=="hello" (because of the ""), causing an error in the
interpretation...

Has anyone an idea ?

Thank you very much !
Best,
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