kicad-developers team mailing list archive

[Shivpratap Chauhan <shivmsit@xxxxxxxxx>]

According to documentation at
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> 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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