Re: [testsuite] gdb.c++/templates.exp

[Daniel Berlin <dberlin@dberlin.org>]

On Wednesday, July 9, 2003, at 11:50 AM, Michael Elizabeth Chastain 
wrote:

> Hi Daniel,
>
>>>   \\(unsigned ?(long|)\\);
>
>> Just to be clear, this regex should accept nothing, "long", "unsigned
>> long", and "unsigned".
>> This may be *wrong*, but it certainly shouldn't accept "unsignedlong".
>> The ? should be applying to "unsigned ", not just the whitespace.
>
> The ? applies to one atom before it.  An atom is just the single
> character ' ', not the whole string 'unsigned '.  So says "Tcl and the
> Tk Toolkit", section 9.3.
>
> It's been that way in Unix regular expressions since the days of 'ed'.
>
> What with the fifty different regular expression implementations out
> there, maybe one of them does behave that way.

Two, actually.

> Not TCL or egrep or perl
> or vim though.
>
Of course, I never bothered to use one of these, i was working with a 
C++ regex engine.

> Michael C