Hello,
I agree also
Thanks Hendrik-Jan
On Sat, Jan 24, 2015 at 11:55 AM, Hendrik Jan Thomassen <h...@atcomputing.nl>
wrote:
> Hi everybody,
>
> We noticed that the LPI Essentials V1.5 still have the following item:
> in: 3.2 Searching and Extracting Data from Files
> under: Key Knowledge Areas
> Basic Regular Expressions using ., [ ], *, and ?
>
> The problem is that '?' is not part of the Basic Regular Expressions
> at all, so this requirement is a contradiction in terms.
>
> The '?'is a part of the Extended Regular Expressions, but i.m.h.o.
> things get too complicated for a beginners level if we have to
> touch on the difference between thasee two.
>
> Just a few examples, exercising this '?' meaning: "zero or
> one of the preceding", and using curly brackets to obtain
> a similar "range from.. to..." effect:
>
> BRE: echo papa | grep 'papa?'
> -> no output
> ERE: echo papa | grep -E 'papa?'
> -> output: papa
> BRE: echo papa | grep 'papa\{0,1\}'
> -> output papa
> ERE: echo papa | grep -E 'papa{0,1}'
> -> output papa
>
> My suggestion: drop the '?' (and don't introduce the curly brackets).
>
> However: I dearly miss the ^ and $ anchors, and in my opinion
> the [^....] is indispensable as well.
>
> Hendrik-Jan
> --
> Hendrik-Jan Thomassen <h...@atcomputing.nl>
> AT Computing
> Linux/UNIXperts,
> opleiders & oplossers Tel +31 24 352 72 82
> Kerkenbos 1238 Tel cursussecretariaat: +31 24 352 72 72
> 6546 BE Nijmegen Fax +31 24 352 72 92
> i...@atcomputing.nl www.atcomputing.nl
>
> 'If you think education is expensive, try ignorance.'
>
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