[erlang-questions] Erlang term to ASCII

Erik Søe Sørensen <>
Fri Feb 7 19:57:35 CET 2014

Regexp substitution?  :-)
(That's the simple path, anyway.)
Den 07/02/2014 19.33 skrev "Brandon Clark" <>:

> I have 2 production systems, one Erlang and one not, both maintaining
> copies of a large, deeply-nested Erlang data structure.  I need to set up a
> monitoring script to confirm that both systems are holding identical copies
> of the data structure.
> The non-Erlang system is holding an ASCII rendering of the data structure.
>  Computing an MD5 sum of this string is easy.  If I can get the Erlang
> system to convert its data structure to a string, I can have it compute an
> MD5 sum as well and the monitoring is simply a matter of comparing hashes.
> I'm stuck on the process of converting the Erlang term to a string.
> Str = io_lib:format("~p", [Data])
> gives me what I want, except that it includes newlines and indentation
> that I can't expect the non-Erlang system to have.
> Str = io_lib:format("~w", [Data])
> eliminates the newlines and indentation but renders the textual components
> of Data as lists of integers, guaranteeing the result won't match the
> non-Erlang system.
> So the question is, how do I get a "~p"-style rendering of an
> arbitrarily-large Erlang term *without* newlines and indentation?
> Thank you!
> ~Brandon Clark
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