awk的match问题

oniziga

刚刚看sed和awk3，做了一下实验：

[root@centos1 upgrade]# awk '{match("womasdRDfadfasKNd", /[A-Z][A-Z]+/); print RSTART, RLENGTH}' -
d
1 3

怎么match匹配后，RSTART是1，RLENGTH是3，难道不是7和2吗？

seesea2517

1. [seesea@UC ~]# echo "xx" | awk '{match("womasdRDfadfasKNd", /[A-Z][A-Z]+/); print RSTART, RLENGTH}'
   
2. 1 3
   
3. [seesea@UC ~]# export LC_ALL=C   
   
4. [seesea@UC ~]# echo "xx" | awk '{match("womasdRDfadfasKNd", /[A-Z][A-Z]+/); print RSTART, RLENGTH}'
   
5. 7 2

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原来是这个问题：
http://bbs.chinaunix.net/thread-4065242-1-1.html

Shell_HAT

1. export LC_ALL=C; awk 'BEGIN{match("womasdRDfadfasKNd", /[A-Z][A-Z]+/); print RSTART, RLENGTH}'

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yestreenstars

1. [root@localhost ~]# awk 'BEGIN{match("womasdRDfadfasKNd",/[[:upper:]][[:upper:]]+/);print RSTART,RLENGTH}'
   
2. 7 2
   
3. [root@localhost ~]#

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或者这样

1. [root@localhost ~]# LANG=C;awk 'BEGIN{match("womasdRDfadfasKNd",/[A-Z][A-Z]+/);print RSTART,RLENGTH}'
   
2. 7 2
   
3. [root@localhost ~]#

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这才是你要的结果~

dn833

http://bbs.chinaunix.net/thread-1332348-1-1.html

oniziga

哇哈哈，这么快就得到了答案。
shell论坛人气好旺，谢谢各位。

还是[[:lower:]]兼容性好

reyleon

为什么要设置LANG=C，而LANG=en_US.UTF-8会有问题！ 能用中文说明下么？这二次碰到这个问题了，还是没记住！ @seesea2517

reyleon

回复 2# seesea2517


    链接里的那个英文写的“正则表达式范围和语言环境”的故事看不懂呀 ，英文太菜··

reyleon

额。原来如此，gawk在新版本中（4.0）中已经解决了这个问题了。 特意为了这个问题下了个新版本尝试了下！

reyleon

1. [root@centos ~]# echo $LANG
   
2. en_US.UTF-8
   
3. [root@centos ~]#
   
4. [root@centos ~]# awk 'BEGIN{match("womasdRDfadfasKNd",/[A-Z][A-Z]+/);print RSTART,RLENGTH}'
   
5. 7 2
   
6. [root@centos ~]#
   
7. [root@centos ~]# awk --version
   
8. GNU Awk 4.1.0, API: 1.0
   
9. Copyright (C) 1989, 1991-2013 Free Software Foundation.
   
10. 
    
11. This program is free software; you can redistribute it and/or modify
    
12. it under the terms of the GNU General Public License as published by
    
13. the Free Software Foundation; either version 3 of the License, or
    
14. (at your option) any later version.
    
15. 
    
16. This program is distributed in the hope that it will be useful,
    
17. but WITHOUT ANY WARRANTY; without even the implied warranty of
    
18. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
19. GNU General Public License for more details.
    
20. 
    
21. You should have received a copy of the GNU General Public License
    
22. along with this program. If not, see http://www.gnu.org/licenses/.
    
23. [root@centos ~]#
    
24. [root@centos ~]#
    
25. 
    

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