Re: awk RE

From

mz1@stlport.org (2:5020/400)

To

Valentin Davydov (2:5054/37.63)

Date

2006-11-17T19:59:58Z

Area

RU.UNIX.BSD

From: mz1@stlport.org

Valentin Davydov <val@sqdp.trc-net.co.jp> wrote:
> $ 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

Андрей Левочкин

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