Re: [sr-dev] dialplan and empty repl_exp

Hello, On 5/7/12 8:57 PM, Juha Heinanen wrote: indeed the .* is at least the posix standard way to match everything, '.' being for matching one single character. Replacements in configuration file/dialplan do not use external library for substitution, only for matching (posix regexp for core/textops which is in libc and libpcre for dialplan). The replacement itself is made via a function from the core (iirc, Andrei Pelinescu-Onciul implemented it in the very early days of ser). I am not that familiar with perl/sed and their full substitution rules, but in Kamailio, practically the subst_exp is supposed to break the matched value in tokens and then back-references in repl_exp can be used to build the new value. Maybe I got used to this kind of model, to group parts of matches values and everything went fine for me. For what Andreas exemplified in the first email in this thread, I would have used: subst="^999(.*)" repl="\1" I would consider a bug if there is no way to remove the full value (i.e., set the result to empty string), like no change will happen with: subst="(.*)" repl="" Personally, I would not mind an update to get to a more common behaviour, if it will be properly documented and referenced to other well established languages/tutorials. So far the term was 'perl-like substitutions' not 'perl substitutions' more for syntax/idea. Also, we have our specific behaviour, the repl expression can include cfg variables (e.g., $avp(...), $var(...), ...) that are expanded when building the result. However, I think it is too late for 3.3.0, because it will introduce lot of changes, perhaps many in the behaviour as well, and we are already 2 weeks in the testing phase. Cheers, Daniel -- Daniel-Constantin Mierla - http://www.asipto.com http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda