Re: Gawk match() and numbers in scientific notation

On 7 Mai, 16:18, Ed Morton <mor...@[EMAIL PROTECTED]
> wrote:
> On 5/6/2008 6:16 AM, Hermann Peifer wrote:
>
> > Hi,
>
> > I am somehwat puzzled with match() results for numbers in scientific
> > notation. See below.
>
> > $ cat testdata
> > 100
> > 100e-3
> > 100E3
>
> > I am wondering what kind of uppercase character is matched in record
> > 2:
>
> > $ gawk '{print $1,match($1,/[A-Z]/)}' testdata
>
> There may not be an uppercase character matching. [A-Z] represents the
lis=
t of
> characters in between the character A and the character Z in your locale

Can you provide some reference for that definition?

I thought that ranges like [A-Z] depend on the _coding_ of the
character set (IOW, on the code values of the characters), and
not depending on the locale.

So that in case you have a different code set than ISO Latin 1,
ASCII, or similar, e.g. like EBCDIC (where there may be other
characters spread in between the letter code positions) you'd
get unexpected results.

So, because of that, your suggestion below is valid anyway, but
I'd like to be sure about what you wrote if that is in fact true.

Janis

> - that
> does NOT mean it has to be upper case characters. For example, your
locale=
 might
> consider characters ordered as:
>
> =A0 =A0 =A0 =A0 aAbBcCdDeEfF....zZ
>
> so "e" would sit between "A" and "Z". That's why you should use
character
> classes instead of specific ranges, e.g.:
>
> =A0 =A0 =A0 =A0 gawk '{print $1,match($1,/[[:upper:]]/)}' testdata
>
> Regards,
>
> =A0 =A0 =A0 =A0 Ed.