This works:
#define STR(...) """" & ... & """"
temp.string = "abc|defg"
pipe.markers = "...|...."
exprstr = STR(temp.string) & " in " & STR(pipe.markers)
expr_id = expr.compile(exprstr)
if l.expr(expr_id) then
foo.bar()
endif

This requires me to use expr.compile every time a new expression needs to be evaluated. Instead I would like to compile the expression once and just assign values to temp.string and pipe.markers and call l.expr on the fly.

According to the Baan help (have not tried this out myself), l.expr can take an optional argument that gets put into "$$", if it exists in your regular expression. So you should be able to do the following:


#define STR(...) """" & ... & """"
temp.string = ""abc|defg"
pipe.markers = "...|...."
|exprstr = STR(temp.string) & " in " & STR(pipe.markers)
exprstr = "$$ in " & STR(pipe.markers)
expr_id = expr.compile(exprstr)
|if l.expr(expr_id) then
if l.expr(expr_id, temp.string) then
foo.bar()
endif


You can then set temp.string to other values and call l.expr without having to do another expr.compile

Actually it looks like you can just put the variable names in the expression itself?

e.g. expr.compile("temp.string in pipe.markers")

I did some testing. It appears that "IN" restricts you to using a constant for the right half.
e.g.
x IN "abc" is permitted but
"abc" IN x is not

Therefore, I don't believe it will be possible to handle variable pipe.markers with a single expr.compile, but you can handle variable temp.string with a single expr.compile.

Thank you. Thank you!

I monitor the board using "View new posts" and somehow your posts went by me. I tried your method and it works great.

And did I thank you :)!