From: tho_mica_l <micathom@...>
Date: 2008-02-08T18:19:56+09:00
Subject: Re: regex dynamic count modifier {min, max} ?

> To parse a logic statement like this:
>
> fn:function3(fn:function2(fn:function1(xargs)))

Are you looking for something like this (ruby19):

def get_fns(string, count=0)
    m = /(?<fn>
            fn:[\w\-]+
            \s*\(\s*
                (\g<fn>|[^)]*)
            \s*\)
        )\s*/xi.match(string)
    if m
        n = /^(fn:[\w\-]+)(\s*)\((.*?)\)$/.match(m['fn'])
        puts "FN #{count}: #{n[1]} with args #{n[3]}"
        get_fns(n[3], count + 1)
    end
end
a = "foo fn:function3(fn:function2(fn:function1(xargs))) foo(bar) bar"
get_fns(a)

> a = "foo fn:function3(fn:function2(fn:function1(xargs))) foo(bar) bar"
> get_fns(a)
FN 0: fn:function3 with args fn:function2(fn:function1(xargs))
FN 1: fn:function2 with args fn:function1(xargs)
FN 2: fn:function1 with args xargs
=> nil

Regards,
Thomas.