Re: awk RE
- From
- Valentin Davydov (2:5020/400)
- To
- mz1@stlport.org (2:5054/37.63)
- Date
- 2006-11-17T20:37:06Z
- Area
- RU.UNIX.BSD
From: Valentin Davydov <val@sqdp.trc-net.co.jp>
> From: mz1@stlport.org
> Date: Fri, 17 Nov 2006 16:59:58 +0000 (UTC)
>
>> $ man awk
>> Patterns are arbitrary Boolean combinations (with ! || &&) of regular
>> expressions and relational expressions. Regular expressions are as in
>> egrep; see grep(1). Isolated regular expressions in a pattern apply to
>> the entire line. Regular expressions may also occur in relational
>> expressions, using the operators ~ and !~. /re/ is a constant regular
>> expression; any string (constant or variable) may be used as a regular
>> expression, except in the position of an isolated regular expression in
>> a pattern.
>>
>> $ echo 000111 | egrep '^0{3}'
>> 000111
>> $ echo 000111 | awk '/^0{3}/'
>> $
>>
>> Это очередная бага в авке или я чего-то не понимаю?
>>
>> Вал. Дав.
>
>Далее оттуда же:
>
> For /regular expression/ patterns, the associated statement is exe-
> cuted for each input record that matches the regular expression.
>
>Т.е. надо просто матча недостаточно, нужно что-то сделать с ним:
>
>$ echo 000111 | awk '/^0{3}/p'
>000111
Ответ неверный:
$ echo 111000 | awk '/^0{3}/p'
111000
$ echo 111000 | egrep '^0{3}'
$
Ещё пред(по)ложения будут?
Вал. Дав.
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