2011/6/3 Rodolfo Carvalho <rhcarva...@gmail.com>:
> Hello,
> I'm curious about 2 design decisions made:
> 1) Why do I have to escape things like "\d{2}" -> "\\d{2}"?
Because "\d" is the same as "d", because you're escaping the character
#\d. But, the syntax for the regular expression is #\backslash #\d, so
you need to get a backslash in there, which is otherwise a control
character, so you need to escape it.
>
> 2) Why there are two kinds of regexps, #rx and #px?
> #rx"\\d{2}" doesn't work because the curly braces are part of just pregexps
> grammar...
#px is more powerful than #rx, but that power costs. Most regexps can
get by with what #rx has.
Jay
>
> []'s
> Rodolfo Carvalho
>
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--
Jay McCarthy <j...@cs.byu.edu>
Assistant Professor / Brigham Young University
http://faculty.cs.byu.edu/~jay
"The glory of God is Intelligence" - D&C 93
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