kicad-developers team mailing list archive

[Jeff Young <jeff@xxxxxxxxx>]

I ended up changing it as little as possible and testing it with https://regex101.com <https://regex101.com/>.  I’m getting the distinct impression that if I went beyond that I’d risk shooting myself in the foot. ;)

> On 6 May 2018, at 06:19, Tiger12506 <tiger12506@xxxxxxxxx> wrote:
> 
> No, '?' also means zero-or-one in RegEx syntax, it's just that it *also* happens to mean "make the previous quantity modifier non-greedy" if there is a previous quantity modifier. Notice the double-question mark regex in the documentation quote previously pasted. That one means make the zero-or-one quantifier non-greedy.
> 
> On 5/5/2018 5:58 PM, Jeff Young wrote:
>> Ahhh… I’m mixing up XPath and RegEx syntax.  ‘?’ is zero-or-one in XPath, not RegEx.
>> 
>> Thanks Shiv & Thomas.
>> 
>> Cheers,
>> Jeff
>> 
>> 
>>> On 5 May 2018, at 15:37, Shivpratap Chauhan <shivmsit@xxxxxxxxx <mailto:shivmsit@xxxxxxxxx>> wrote:
>>> 
>>> According to documentation at http://docs.wxwidgets.org/3.0/overview_resyntax.html <http://docs.wxwidgets.org/3.0/overview_resyntax.html>
>>> 
>>> *? +? ?? {m}? {m,}? {m,n}?	Non-greedy quantifiers, which match the same possibilities, but prefer the smallest number rather than the largest number of matches (see Matching <http://docs.wxwidgets.org/3.0/overview_resyntax.html#overview_resyntax_matching>).
>>> There seems to be difference greedy vs non-greedy quantifiers!
>>> 
>>> 
>>> Thanks,
>>> Shiv
>>> 
>>> 
>>> 
>>> On Sat, May 5, 2018 at 6:49 PM, Jeff Young <jeff@xxxxxxxxx <mailto:jeff@xxxxxxxxx>> wrote:
>>> We have a couple of regular expressions of the form:
>>> 
>>>    wxRegEx re( ".*?\\$\\{(.+?)\\}.*?", wxRE_ADVANCED );
>>> 
>>> Now perhaps I’m too old to remember this stuff correctly, but .*? is redundant, isn’t it?
>>> 
>>> And shouldn’t .+? just be .*?  (And for that matter, shouldn’t it really be [^}]*?)
>>> 
>>> Thanks,
>>> Jeff.
>>> 
>>> 
>>> Note that I’m looking at this because it needs to check for both ${…} and $(…) formatted envvars, which I think boils down to:
>>> 
>>> .*(\\$\\{([^}]*)\\})|(\\$\\(([^)]*)\\)).*
>>> 
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>> 
>> 
>> 
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