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Date: Fri, 28 Aug 2015 18:01:09 +0200 (CEST)
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From: gedau AT igor2 DOT repo DOT hu
Subject: Re: [geda-user] when pcb disperse command loses elements
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On Fri, 28 Aug 2015, gedau AT igor2 DOT repo DOT hu wrote:

> Tested it now, it seems it's not pure regex but does some 
> transformation/magic, probably assuming the format will be letter-number or 
> forcing match from the beginning of the refdes, I'm not sure.
>

Meanwhile I took a look at the code. It seems regexec_match_all() does the 
regex match and then checks whether the match fully covers the string.

This is the same as if it wrapped any search x in ^x$. So in mainline PCB 
your regex needs to match each character of the name; if you don't want ^ 
or $, you need to use .* at the beginning or at the end.

I support the Rule of Least Surprise, and this is not how regex usually 
works. Thus I changed this in pcb-rnd: it now has pure regex support, 
without further checks, it doesn't invent or force ^ or $. I also 
modified the query dialog so that it mentions the pattern you input is 
regex.

Regards,

Igor2