sed匹配问题

asdf2110

1. sed -r 's/./-&/g'

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表示在每个字符的前面加一个 -
如果不想在首字符前面加，用[^]该怎么处理呢？
sed 's/[^^.]/_&/g'
这样试了不好用，是不是 [] 内的不支持正则匹配呢？

seesea2517

试试这个：

1. sed -r 's/\B/-/g' 1.txt  

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[] 里的 ^ 应该没有了句首的含义了吧，还真没注意过这个。

asdf2110

回复 2# seesea2517

嗯，这个可以，多谢


   

seesea2517

回复 3# asdf2110


    也可以用你那个再加上删除开头的 -: s/^-//g

asdf2110

回复 4# seesea2517

嗯，那个可以，我又试了awk的gsub和gensub，结果和 sed 有点不一样

1. echo test | awk '{print gensub(/\B/,"-","g",$0)}'
   
2. echo test | awk '{gsub(/\B/,"-",$0);print}'

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这俩结果都是 ： t-e-st

我看网上说 \B 匹配非边界字符，按理说 s 应该能匹配啊


   

blackold

回复 5# asdf2110


    前提是你的文本全部为单词字符。

yestreenstars

回复 5# asdf2110


    版本不同？

1. [root@localhost ~]# echo test | awk '{print gensub(/\B/,"-","g",$0)}'
   
2. t-e-s-t
   
3. [root@localhost ~]# echo test | awk '{gsub(/\B/,"-",$0);print}'
   
4. t-e-s-t
   
5. [root@localhost ~]# awk --version
   
6. GNU Awk 3.1.3
   
7. Copyright (C) 1989, 1991-2003 Free Software Foundation.
   
8. 
   
9. This program is free software; you can redistribute it and/or modify
   
10. it under the terms of the GNU General Public License as published by
    
11. the Free Software Foundation; either version 2 of the License, or
    
12. (at your option) any later version.
    
13. 
    
14. This program is distributed in the hope that it will be useful,
    
15. but WITHOUT ANY WARRANTY; without even the implied warranty of
    
16. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
17. GNU General Public License for more details.
    
18. 
    
19. You should have received a copy of the GNU General Public License
    
20. along with this program; if not, write to the Free Software
    
21. Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    
22. [root@localhost ~]#

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asdf2110

回复 7# yestreenstars
还真是，我的是 3.1.5

1. $ awk --version
   
2. GNU Awk 3.1.5
   
3. Copyright (C) 1989, 1991-2005 Free Software Foundation.
   
4. 
   
5. This program is free software; you can redistribute it and/or modify
   
6. it under the terms of the GNU General Public License as published by
   
7. the Free Software Foundation; either version 2 of the License, or
   
8. (at your option) any later version.
   
9. 
   
10. This program is distributed in the hope that it will be useful,
    
11. but WITHOUT ANY WARRANTY; without even the implied warranty of
    
12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
13. GNU General Public License for more details.
    
14. 
    
15. You should have received a copy of the GNU General Public License
    
16. along with this program; if not, write to the Free Software
    
17. Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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asdf2110

回复 6# blackold

谢谢回复，test 都是单词字符吧，可能真的和版本有关，7L的3.1.3版本正常，我的3.1.5版本不正常


   

yestreenstars

啊，版本高的反而不行，我还以为你的版本太低所以不行呢。回复 8# asdf2110