awk RE

From

Artem S. Ignatiev (2:5020/2395)

To

mz1@stlport.org (2:5054/37.63)

Date

2006-11-18T01:24:40Z

Area

RU.UNIX.BSD

Вижу вас хорошо --- слышу вас плохо, mz1!

17 ноя 06 19:59, ты слова Valentin Davydov про всяких Re: awk RE:

 m> From: mz1@stlport.org

 m> 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?
 >>

 m> Далее оттуда же:

 m>         For /regular expression/ patterns, the associated  statement
 m> is  executed for each input record that matches the regular
 m> expression.

 m> Т.е. надо просто матча недостаточно, нужно что-то сделать с ним:

 m> $ echo 000111 | awk '/^0{3}/p'
 m> 000111

Ранее оттуда же:
A pattern-action statement has the form

              pattern { action }

       A  missing  {  action  } means print the line; a missing pattern always
       matches.  Pattern-action statements are separated by newlines or  semi-
       colons.
[timon@timon timon]$ echo '0{3}111' | awk '/^0{3}/'
0{3}111
[timon@timon timon]$

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